osmotic pressure chemistry

10,971 results, page 96
  1. Chemistry

    A vessel containing 39.5 cm3 of helium gas at 25°C and 106 kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure of helium. If this required 18.8 cm3 of ethanol, what was the

    asked by Hannah on September 22, 2013
  2. CHEM

    A cylinder with a movable piston contains 2.00 of helium, , at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume

    asked by Kara on October 24, 2008
  3. chemistry

    A cylinder with a movable piston contains 2.00 g of helium, He, at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the

    asked by sargun on September 29, 2017
  4. Chemistry

    A vessel containing 39.5 cm3 of helium gas at 25°C and 106 kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure of helium. If this required 17.8 cm3 of ethanol, what was the

    asked by jacfar on January 21, 2013
  5. Chemestry

    A cylinder with a movable piston contains 2.00 of helium, , at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume

    asked by Monica on October 3, 2009
  6. Chemistry

    A vessel containing 39.5 cm3 of helium gas at 25°C and 106 kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure of helium. If this required 17.8 cm3 of ethanol, what was the

    asked by flame on January 24, 2013
  7. science

    Here are all the word you can use chemical property mixture heatcapasity homogeneous viscosity sublimitation physicalproperty compound chemicalformula substance density mass tempurature pressure heterogenerous A _________ property of matter describes its

    asked by jacob on April 11, 2016
  8. AP Physics

    A Physics book has a height of 26 cm, a width of 22 cm, and a thickness of 4 cm. Find the pressure that the Physics book exerts on a desktop when the book lies face up and when the book is balanced on its spine. I know that P=F/A, I am just not sure which

    asked by JL on November 15, 2009
  9. Chemistry

    If 0.433 mol of gaseous CS2 and 1.62 mol of gaseous H2 are reacted according to the balanced equation at 454 K and in a 40.0 L vessel, what partial pressure (atm) of gaseous CH4 is produced? CS2(g) + 4H2(g) -> CH4(g) + 2H2S(g) Molar Mass (g/mol) CS2 76.143

    asked by Luc on April 11, 2010
  10. chemistry 11

    Hi, I am stuck on a couple questions in chemistry 11. The questions are 1. Calculate the number of moles of the anhydrous salt left behind 2. Calculate the number of moles of water removed by heat from your sample of hydrate. 3. Calculate the moles of

    asked by Daniel on November 22, 2009
  11. Thermal physics

    when breathing slowly a person inhales air at room temperature and exhales it at body temperature. We may assume that the lungs maintain ordinary atmospheric pressure as they expand. If a resting person inhales 0.6L of air at 24 degrees what volume does

    asked by Kelly on June 24, 2010
  12. Chemistry

    The combustion of 0.0222g of isooctane vapor, C8H18(g), at constant pressure raises the temperature of a calorimeter 0.400 degrees C. The heat capacity of the calorimeter and water combined is 2.48kJ/degrees C. Find the molar heat of combustion of gaseous

    asked by Heather on October 9, 2012
  13. science

    How many litres of oxygen are needed to react completely with 25.0L of H2S at STP according to the following reaction: 2H2S + 3o2 --> 2so2 + 2H2O At STP temperature is 273 K pressure is 101.3 Kpa R is 8.314 so PV=nRT 101.3×25= n× 8.314× 273 n= 1.11 so

    asked by fayza on January 19, 2015
  14. Chem

    Cyclopropane (C3H6) reacts to form propene (C3H6) in the gas phase. The reaction is first order in cylclopropane and has a rate constant of 5.87*10^-4 at 485degreesC. If a 2.5L reaction vessel initially contains 724 torr of cyclopropane at 485degreesC, how

    asked by Bryan on February 24, 2011
  15. Physics Urgent

    A container of volume V = 103 cm3 has a mass of 30.0042 g when evacuated. When the container is filed with an unknown gas of pressure p = 4.72 atm at temperature T = 20oC, the mass of the system increases to 30.9508 g. Assuming that the unknown gas behaves

    asked by Sydney on November 9, 2010
  16. Physics

    A cylinder with a moveable piston holds 2.60 mol of argon at a constant temperature of 295 K. As the gas is compressed isothermally, its pressure increases from 101 kPa to 149 kPa. (a) Find the final volume of the gas. Answer in m3 (b) Find the work done

    asked by steve on April 15, 2011
  17. Chemistry

    a. How many moles of N2 are present in a 1.00 qt flask that has a pressure of 425 torr at a temperature of 35°C? What is the mass in this na2? It would be much simpler to change quart to liters first, then torr to kpa PV=nRT n= PV/RT Temps in Kelvins, V

    asked by Chelsey on February 26, 2014
  18. Physics Urgent

    A container of volume V = 103 cm3 has a mass of 30.0042 g when evacuated. When the container is filed with an unknown gas of pressure p = 4.72 atm at temperature T = 20oC, the mass of the system increases to 30.9508 g. Assuming that the unknown gas behaves

    asked by Sydney on November 9, 2010
  19. Chemistry

    Can someone walk me through how to work this I have no clue where to start. I have converted grams to moles and Celsius to kelvin but I don't know where to go from there. Thank you! A piece of dry ice (solid CO2, d = 0.900 g/mL) weighing 21.0 g is placed

    asked by James on October 5, 2013
  20. chemistry

    A sample of argon of mass 10.4 g occupies 2100 ml at 30 oC . (i) Calculate the work done by the gas when it expands isothermally against a constant external pressure of 31.1kPa until its volume has increased by 483.1ml. (ii) Calculate the work done by the

    asked by sand on January 11, 2012
  21. Chemistry

    1.) A vapor volume of 1.17 L forms when a sample of liquid CH3CN absorbs 1.00 KJ of heat at its normal boiling point (81.1 C and 1 atm). What is the heat of vaporization in KJ per moles of CH3CN? 2.) The vapor pressure of water at 25 C is 23.76 torr. If a

    asked by joseph on February 15, 2010
  22. Chemistry Help.......

    State the Le Chatelier's principle and explain the following i) The effect that incresing the pressure will have on the eaualibrium yield of methanol ii) The effect of increasing the temperature will have on the equalibrium yeild of methanol iii) The

    asked by Lacey on March 12, 2007
  23. Biology

    Which one of the following statements about sense receptors is true? A)Chemicals, light and pressure convert stimuli into electrical implses. B) Electrical impulses within the nerve pathways trigger an awareness of stimuli in the sensory receptors

    asked by Rena on September 1, 2010
  24. Physics sph 212

    A person takes in a breath of 0 degrees celsius air and holds it until it warms to 37 degrees celsius. The air has an initial volume of 0.700L and a mass of 9.00*10^-4kg. Determine a. the work done by the air on the lungs if the pressure remains constant

    asked by Tiera on April 6, 2012
  25. Chemistry

    A 10.8g sample of a gas has a volume of 5.25L at 25 degrees Celsius and 766mmHg. If 2.3g of the same gas is added to this constant 5.25L volume and the temperature raised to 68 degrees Celsius, what is the new gas pressure?

    asked by Jen on January 19, 2011
  26. chemistry

    What volume of a oxygen at STP was collected? oxygen gas is collected over water at a temperaturee of 10 degrees C and a pressure 1.2 atm. The volume of gas plus water vapor collected is 293ml.

    asked by dee on April 6, 2016
  27. physics

    pls.. help me with this i really need it.. pls. A gas in a cylinder expands from a volume of 0.110 m3 to 0.320 m3. Heat flows into the gas just rapidly enough to keep the pressure constant at 1.65 x 105 Pa during the expansion. The total heat added is 1.15

    asked by acinad on June 23, 2014
  28. PHYSICS

    Water flowing out of a horizontal pipe emerges through a nozzle. The radius of the pipe is 1.5 cm, and the radius of the nozzle is 0.42 cm. The speed of the water in the pipe is 0.68 m/s. Treat the water as an ideal fluid, and determine the absolute

    asked by Anonymous on November 18, 2015
  29. chemistry

    The kinetic theory of gases is based on a number postulates from which the equation P= 1/3× N/V×m×µ² is derived (P is the pressure of the gas, N the number of molecules in the container, m the mass of each molecule and µ² is the mean square speed).

    asked by Taylor on December 26, 2013
  30. Chem

    If 4.0 grams of hydroven, 6.02 x 10^22 atoms of helium and 4.48 liters of argon, measured at STP are placed in a 2.0 liter flask, at 27 degrees C, what is the final pressure? Under controlled conditions the velocity of hydrogen molecules was found to be

    asked by Anonymous on November 23, 2008
  31. physics

    1kg of ice at 0C is placed in a container with 2kg of water at 65C. The container is in an atmospheric pressure that remains at 15C. There is a free exchange of energy between all items so that a final temperature of 15C is reached. Calculate the amount of

    asked by Ezekiel on February 21, 2016
  32. Chemistry

    I need help with this problem A 0.75–L bottle is cleaned, dried, and closed in a room where the air is 22oC and 44% relative humidity (that is, the water vapour in the air is 0.44 of the equilibrium vapour pressure at 22oC). The bottle is brought outside

    asked by xavier on December 9, 2012
  33. Chemistry

    The vapor pressure of water above a sugar water solution at 25.0 degrees C is 21.4 mmHg. What is the mole fraction of sugar in the solution? (assume sugar is a non-electrolyte, non-volatile solute and the vp of pure water at 25 degrees C is 23.8 mmHg)

    asked by Jake on February 4, 2008
  34. Physics

    An airplane wing is designed so that the speed of the air across the top of the wing is 274 m/s when the speed of the air below the wing is 193 m/s. The density of the air is 1.29 kg/m3. What is the lifting force on a wing of area 25.0 m2?

    asked by Jay on December 9, 2011
  35. Physical Science

    1. boyle's law states that the volume of a gas is inversely proportional to its pressure if the? A) temperature and number of particles are consistent** B) temperature reaches absolute zero C) number of particles are doubled D) temperature and number of

    asked by ? on September 7, 2017
  36. chemistry

    Equal masses of gaseous N2 and Ar are placed in separate flasks of equal volume at the same temperature. Tell whether each of the following statements is true or false. Briefly explain your answer in each case. (a) There are more molecules of N2 present

    asked by Gabriela on March 30, 2007
  37. Chemistry

    A compound containing boron and hydrogen has been synthesized. You perform two experiments to determine the molecular formula of the compound. A 0.492 g sample of the compound is burned in pure oxygen to produce B2O3 and 0.540 g of water. In the second

    asked by Anna on October 16, 2014
  38. Alpha decay

    Hi I am working on a question which discusses ununhexium atomic number 116 atom weight 292. This isotope undergoes 7 alpha decay reactions. I have calculated that after seven reactions the product would be 102 nobelium. I cannot understand how the atomic

    asked by Atom ant on January 17, 2007
  39. chemistry

    (a) Certain alloys such as LaNi5 can store hydrogen at room temperature. A plate of LaNi5 containing no hydrogen is placed in a chamber filled with pure hydrogen and maintained at a constant pressure. At what depth from the surface will the concentration

    asked by kiril on December 7, 2012
  40. Physics

    As its volume is doubled from an initial value of 0.088 m3, a sample of gas is held at a constant pressure of 3.4 × 104 Pa by heating. Then, while a constant volume is maintained, the gas is cooled back to its initial temperature. The work that the gas

    asked by Kaley on June 21, 2012
  41. Chemistry

    The compound CH3F has van der Waals constants a = 5.009 atm•L2 /mol 2 and b = 0.0562 L/mol. Using both the ideal gas law and van der Waals’s equation, calculate the pressure expected for 25 mol of CH3F gas in a 5.00-L container at 75 °C. no idea how

    asked by Sarah on December 2, 2012
  42. college chemistry

    Consider the following equation: 4 NH3(g) + 5 O2(g)= 4 NO(g) + 6 H2O(s) a) HOw many liters of oxygen are required to react with 205 L NH3? Both gases are STP. b)How many grams of water vapor can be produced from 25 L NH3 if both gases are STP? c) How many

    asked by la fonda on April 29, 2014
  43. physics

    A hydraulic cylinder has to overcome a force of 12,600 pounds on the extend stroke and 9,375 pounds on the return stroke. The maximum system pressure available is 2200 PSIG. What is the smallest diameter cylinder required to overcome the load and what is

    asked by emma on April 1, 2015
  44. equilibrium III

    what's Kp if Cl2CO was found to be 7.46% decomposed at 395'C when initial pressure is 7.60atm. Cl2CO -->

    asked by christine on April 11, 2007
  45. chemistry/math

    The density of air at ordinary atmospheric pressure and 25°C is 1.19 g/L. What is the mass, in kilograms, of the air in a room that measures 12.0 ft 12.5 ft 7.3 ft? i made ft^3 into Liters and got 8,346,211.799 then I made the grams into kilograms and set

    asked by Hannah on August 19, 2012
  46. PHYSICS

    At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at a temperature of 19°c,how

    asked by Riana on April 1, 2013
  47. physics

    At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at a temperature of 19°c,how

    asked by Riana on April 1, 2013
  48. PHYSICS help please!!!!!!!!!!

    At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at a temperature of 19°c,how

    asked by Riana on April 1, 2013
  49. physics

    At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at a temperature of 19°c,how

    asked by Riana on April 1, 2013
  50. chemistry

    Consider the conditions listed in the table below. Gas Temperature Pressure H2 100 oC 1 atm CH4 100 oC 20 atm O2 373 K 1 atm CO2 373 K 10 atm Which describes the characteristics of these samples? I. All molecules have the same kinetic energy II. The

    asked by ... on November 14, 2012
  51. Chemistry

    Question: A sample of Freon-12 (CF2Cl2) occupies 2.261 x 101 L at 337 K and 2.917 x 102 kPa. Find its volume (in L) at standard temperature and pressure (STP). Equation: p1v1/t1=p2v2/t2 My Work: (2.917 x 102 kPa)(2.261x101 L)/337K = (101.3 kpa)( x )/273 k

    asked by Bradley on July 13, 2011
  52. chemistry

    a balloonist is preparing a trip in a helium balloon. the trip begins in early morning at a temp of 15 degrees Celcius. By mid afternoon, the temp has increased to 30 degrees C. assuming the pressure remains constant at 1.00 atm, for each mole of helium,

    asked by Joan on March 20, 2011
  53. science

    Some say that the hot air balloons with which the Montgolfier brothers performed their first flight had a volume of 1700 cubic metres and could lift 780 kilograms (that includes the balloon, basket and payload). Assume that the balloon took off on a day

    asked by sakthi on July 15, 2015
  54. physics

    Some say that the hot air balloons with which the Montgolfier brothers performed their first flight had a volume of 1700 cubic metres and could lift 780 kilograms (that includes the balloon, basket and payload). Assume that the balloon took off on a day

    asked by Nick on March 27, 2014
  55. Social Studies

    What was Truman's response when communism began spreading beyond the soviet-run eastern Europe? A. He made a plea to the united nations to adopt the policy of containment B. He sent in military to the soviet union to pressure them to contain communism C.

    asked by 1020304050 on March 19, 2017
  56. physics

    Two chambers are filled with a fluid. The ceiling of chamber 1 is at the same level as the floor of chamber 2. The pressure at the floor of chamber 2 is 1.2 × 105 Pa. If the area of the ceiling of chamber 1 is 2.0 m2, what is the magnitude F of the force

    asked by Tyler on February 8, 2017
  57. Intro to Technology

    a short article of 200 to 300 words in your notebook, including the following information: · What are some uses for CAD in business, industry, or education? · Name two software programs that you could learn to use to create a CAD project. · Describe one

    asked by Eduardo Gonzalez on March 4, 2010
  58. Thermodynamics

    a rigid vessel of volume 1m(^3) contains steam at 20bar and 400 degrees Celcius. The vessel is cooled until the steam is just dry saturated. Calculate the mass of steam in the vessel, the final pressure of the steam and the heat rejected during the

    asked by Claire on March 12, 2010
  59. Chemistry-gases

    Nitrogen dioxide reacts with water and oxygen in the atmosphere to produce acid rain. 4NO2(g) + 2H2O(g) + O2(g) = 4HNO3(g) Assuming that the temperature and the pressure remain constant, calculate the volume of air at 1 atm, 20 C, necessary to dilute the

    asked by Rose Bud on March 2, 2012
  60. English

    I still have a sentence on the listening comprehension for you to check. Thank you. 1) It fights for the release of people imprisoned for racism and political prisoners. 2) Its local groups operate by collecting information about prisoners, and then make

    asked by Matthew on April 15, 2012
  61. Pre Calc (question was never answered)

    Write the statement as a power function equation. Use k for constant of variation if one is not given. a. Charles's law states the volume V of an enclosed ideal gas at a constant pressure varies directly as the absolute temperature T. b. The volume V of a

    asked by Muffy on October 18, 2009
  62. PRE-CALC still stuck

    Write the statement as a power function equation. Use k for constant of variation if one is not given. a. Charles's law states the volume V of an enclosed ideal gas at a constant pressure varies directly as the absolute temperature T. b. The volume V of a

    asked by Muffy on October 18, 2009
  63. Pre-Calc

    Write the statement as a power function equation. Use k for constant of variation if one is not given. a. Charles's law states the volume V of an enclosed ideal gas at a constant pressure varies directly as the absolute temperature T. b. The volume V of a

    asked by Muffy on October 17, 2009
  64. chem

    The decomposition of ammonium hydrogen sulfide that is shown below is an endothermic process. NH4HS(s) reverse reaction arrow NH3(g) + H2S(g) A 6.1589 g sample of the solid is placed in an evacuated 4.000 L vessel at exactly 24°C. After equilibrium has

    asked by Anonymous on February 10, 2010
  65. Chemistry-gases

    Nitrogen dioxide reacts with water and oxygen in the atmosphere to produce acid rain. 4NO2(g) + 2H2O(g) + O2(g) = 4HNO3(g) Assuming that the temperature and the pressure remain constant, calculate the volume of air at 1 atm, 20 C, necessary to dilute the

    asked by Rose Bud on March 2, 2012
  66. Chemisty

    An ideal gas with an initial volume of 96L, temperature of 277K, and 7.3mol is permitted to come to a second state with a volume of 450mL and a temperature of 203C. Show the calculation for the final number of moles of gas in the system.

    asked by Kevin on April 11, 2016
  67. chemistry

    The combustion of 0.0222g of isooctane vapor, C8H18(g), at constant pressure raises the temperature of a calorimeter 0.400 C. The heat capacity of the calorimeter and water combined is 2.48 kJ/C. Find the molar heat of combustion of gasdeous isooctane.

    asked by Anonymous on February 5, 2011
  68. Chem

    Review example 5.10 and exercise 5.10. Suppose 1.58 moles of N2 and 0.420 moles of O2 occupy 22.41 L at a total pressure of 2.00 atm. Use XA = to determine the (decimal) mole fractions of both components. Then, use XA = to determine the partial pressures

    asked by Feather on October 11, 2014
  69. q, w, and DU

    A gas is allowed to expand at constant temperature from a volume of 2.00 L to 11.20 L against an external pressure of 1.500 atm. If the gas loses 256 J of heat to the surroundings, what are the values of q, w, and DU? Pay careful attention to units. a.

    asked by Raymonddd on June 12, 2009
  70. Chemistry--DrBob222

    Estimate the number of moles of gas (and mass of gas assuming that it is all N2) inside your family car (or a friends if you don't have one). If the amount of gas was compressed at constant temperature to fit inside a coke can what ould the pressure inside

    asked by Timofey on May 27, 2013
  71. Physics

    An ideal gas in a moveable piston is allowed to reversibly expand by slowly heating at constant pressure. a. Derive the equation for the work done reversibly as a function of the initial and final temperatures.( i have used w=-nrtln(v final/v intial) i

    asked by Carlos on March 1, 2017
  72. Chemistry

    A flask has 1.00 L of O2 (g) at STP (the amount of gas and volume are held constant, P=1 bar) and the second has 1.00 L of O2 at 100 C. What mass of O2 must release if we get the pressure to remain at 1.00 bar when it's heated to 100 C? Can someone please

    asked by Kristine on October 3, 2012
  73. Chemistry-Please help

    In an air-conditioned room at 19.0 degree celsius , a spherical balloon had the diameter of 50.0cm . When taken outside on a hot summer day, the balloon expanded to 51.0cm in diameter. What was the temperature outside in degree celsius? Assume that the

    asked by Rose on October 16, 2009
  74. Chemistry

    A sample of Oxygen has occupies 1.00x10^6mL at 575mm Hg is subjected to a pressure of 1.25atm. What will the final volume of the sample be if the temperature is held constant v2=(p1)(p2)/p2 I'll have to convert 1.25atm to mm first 1.25atm*760mm/1.0atm =

    asked by Chopsticks on March 19, 2009
  75. physics

    what is the physics behind the process of administering the following 1. measurement of blood pressure using sphygmomanometer 2.giving injections 3.administering intravenous infusion 4.giving oxygen in the ward and operating theater 5. administering blood

    asked by Williams on March 6, 2014
  76. Chemistry

    Acetylene (C2H2) and hydrogen fluoride (HF) react to give difluoroethane: C2H2+2HF->C2H4F2 When 2.3 mol of C2H2 and 12 mol HF are reacted in a 15.4 L flask, what will be the pressure in the flask at 13°C when the reaction is complete? I know I'm supposed

    asked by Dewey on April 17, 2011
  77. ~ CHEMISTRY ~

    If k is a constant, how will a change in volume change the pressure? Choose one set of numbers. Assign one of them to represent P and the other to represent V. What happens to P if V is assigned the larger number? What happens to P if V is assigned the

    asked by Anonymous on March 26, 2016
  78. Chemistry

    For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm for all species. For the reaction 2NO(g) + O2(g) --> 2NO2(g) the standard change in Gibbs free energy is ΔG° = -69.0 kJ/mol. What is ΔG for this reaction at 298 K when

    asked by Janavi on March 23, 2014
  79. Chemistry

    A 20.29 g sample of impure MgCO3 is completely decomposed at 1000oC in previously evacuated 2.0 L reaction vessel. After the reaction was complete the solid residue had a mass of 15.9 g. Assume that only MgCO3 could produce gas CO2 what percent of original

    asked by Jordan on December 3, 2008
  80. Psychology

    As a scientist,Carl is concerned with the intensity of lights in the modern human environment.In his research project,Group A consists of volunteers who have agreed to sleep each night for a week with a 150 watt light bulb hanging over their bed.Group C

    asked by Sandra on July 5, 2012
  81. Chemistry

    16.3L N2 at 25 degrees Celsius and 125 kPa and 41.9L O2 at 25 degrees Celsius and 125 kPa were transferred to a tank with a volume of 5.25L. What is the total pressure at 55 degrees Celsius?

    asked by Matt on November 14, 2013
  82. Chemistry

    One mole of carbon (12.0 g) in the form of crystalline graphite is burned at 25 ◦ C and 1.000 atm pressure to form CO2(g). All of the heat produced is used to heat a 4560 g bath of liquid water, originally at 25 ◦ C. What is the final temperature of

    asked by Sam on October 8, 2012
  83. Chemistry

    For Carbon dioxide, for a volume of 500 mL and temperature of 100 degrees celcius, calculate the pressures using the ideal gas law and the van der Waals equation. Explain any dicrepancies in the calculated values. Ideal Gas Equation: Van Der Waals Equation

    asked by Leah on November 1, 2010
  84. Chemistry

    The following information is given for ethanol, C2H5OH, at 1atm: boiling point = 78.4oC Hvap(78.4oC) = 38.6 kJ/mol melting point = -115oC Hfus(-115oC) = 5.02 kJ/mol specific heat liquid = 2.46 J/goC At a pressure of 1 atm, what is H in kJ for the process

    asked by Jordan on January 24, 2011
  85. AP Physics

    Assume that at sea-level the air pressure is 1.0 atm and the air density is 1.3 kg/m3. (a) What would be the height of the atmosphere if the air density were constant? 7.919 km (b) What would be the height of the atmosphere if the air density decreased

    asked by Brian on December 3, 2009
  86. phsyics

    Each of the space shuttle’s main engines is fed liquid hydrogen by a high-pressure pump. Turbine blades inside the pump rotate at 617 rev/s. A point on one of the blades traces out a circle with a radius of 0.020 m as the blade rotates. (a) What is the

    asked by jack on November 1, 2010
  87. Chemistry

    At 900 K the following reaction has Kp=0.345; 2 SO2(g) + O2 (g) -> 2 SO3 (g) In an equilibrium mixture the partial pressures of SO2 and O2 are 0.145 atm and 0.455 atm, respectively. What is the equilibrium partial pressure of SO3 in the mixture?

    asked by Anonymous on September 7, 2009
  88. Algebra

    Using Proportionality symbol The height of Big Foot is 10 times that of an ordinary ape. How many times is the weight of an ordinary ape? How many times is the surface area that of an ordinary ape? How many times is the pressure on the feet that of an

    asked by Frank on November 27, 2011
  89. Chemistry

    For the chemical reaction CH3Br + OH- CH3OH + Br-, which of the following would speed up the reaction? increasing the CH3Br concentration reducing the OH concentration cooling the reactant mixture Please help with this question. I appreciate it. Thank you.

    asked by Lucy on April 16, 2012
  90. general science

    Increasing depths in the ocean causes a what in sunligh. Increasing depths in the ocean causes a what in pressure. Producer in the upper three zones of the ocean use what while producer in the lower ocean zones use what to generate nutrients to support the

    asked by kendra` on February 9, 2011
  91. physics

    A rectangular box of length 2/3m is initially traveling at 2 m/s with its entire length over a smooth (perfectly frictionless)surface .The box gradually moves onto a rough surface and stops the instant that its entire length is positioned within the rough

    asked by unowen on November 19, 2017
  92. Chemistry

    pyrite, FeS2 reactswhen it is heated strongly in the air according to the equation 4 FeS2(s) + 11 O2 rightarrow 2 Fe2O3(s) + 8 SO2(g) What volume of sulfir dioxide ( measured at room temprature and pressure) would be produced by heating 100g of pyrite in

    asked by raina on February 25, 2015
  93. Chemistry

    C6H12O6 (aq) = 602 (g) - 6CO2 (g) = 6H20 (l) H -2837 A)Exo or endothermic? B)write an expression for the equilibrium constant C)Give the value of the equilibrium constant is very large, would this reaction be fast or slow? D)effects of equilibrium if.. i.

    asked by Caitie on April 29, 2015
  94. chem!

    i cant figure this one out! :( a balloonist is preparing a trip in a helium balloon. the trip begins in early morning at a temp of 15 degrees Celcius. By mid afternoon, the temp has increased to 30 degrees C. assuming the pressure remains constant at 1.00

    asked by Joan on March 21, 2011
  95. Chemistry

    copper is a product of the reaction that occurs when dry ammonia is passed over a sample f heated copper(2) oxide.The equation for the reaction is given: 2NH3+3CuO=3Cu+3H2O+N2 Calculate the mass of copper produced if 0.12dm^3 of nitrogen is produced at

    asked by Alyssa on November 27, 2014
  96. Chemistry

    3.A sealed balloon contains 62mL of carbon dioxide is in a freezer at -15degrees celsius. The balloon is then removed to the interior of a car that has been sitting there this summer sun and is at 72degrees celsius. Assuming the balloon remains sealed and

    asked by Samantha on May 17, 2018
  97. physics

    A car misses a turn and sinks into a shallow lake to a depth of 8.9 m. If the area of the car door is 0.51 m2, what is the force exerted on the outside of the door by the water? Note: 1 atm = 101.325 kPa. What is the force exerted on the inside of the door

    asked by katie please help:) on April 2, 2012
  98. fluid mechanics

    A brick weighs 15.0 N and is resting on the ground. Its dimensions are 0.203 m multiplied by 0.0890 m multiplied by 0.0570 m. A number of the bricks are then stacked on top of this one. What is the smallest number of whole bricks (including the one on the

    asked by cindy on November 30, 2008
  99. physics please help:)

    A car misses a turn and sinks into a shallow lake to a depth of 8.9 m. If the area of the car door is 0.51 m2, what is the force exerted on the outside of the door by the water? Note: 1 atm = 101.325 kPa. What is the force exerted on the inside of the door

    asked by Katie on April 2, 2012
  100. Chemistry

    The following information is given for ether, C2H5OC2H5, at 1atm: boiling point = 34.6oC Hvap(34.6oC) = 26.5 kJ/mol melting point = -116oC Hfus(-116oC) = 7.27 kJ/mol specific heat liquid = 2.32 J/goC At a pressure of 1 atm, what is H in kJ for the process

    asked by Hannah on February 10, 2012