1. physics

    A detective is investigating a scene of an accident. He measures the length of an automobile's skid marks to find out how fast the automobile was going at the very beginning of the skid. Express In terms of V ( speed), L ( length) and any other suitable

    asked by Riley on June 10, 2017
  2. Chemistry

    A student must make 500 mL of a 1.5 M HCl solution. The student has plenty of water and a stock solution of 6.0 M HCl to use. What volume of the 6.0 M HCl solution must be added to what volume of water to make the desired 500 mL of 1.5 M solution? I don't

    asked by Katie on March 8, 2009
  3. safety

    i need to find information on the history of the automobile and how it has impacted the world (changed the world as well) economically and socially. thank you History of the automobile: http://en.wikipedia.org/wiki/History_of_the_automobile As far as the

    asked by Amy on March 27, 2007
  4. Physics

    A multicylinder gasoline engine in an airplane, operating at 2500 rev/min, takes in 7800 J of energy and exhausts 4600 J for each revolution of its crankshaft. What is the mechanical power output of the engine in kilowatts.

    asked by Anonymous on June 16, 2016
  5. Chemistry

    Concentration 15.8 mg/L Final Volume 100.0 mL What is the concentration of phosphate in the original lake water sample if the unknown lake water sample in the option has been diluted by taking 25.0 mL of lake water and diluting it to the indicated final

    asked by Anon on December 6, 2012
  6. history

    Any suggestions on how to build a model train engine with everyday household products? Thanks! Thank you for using the Jiskha Homework Help Forum. Here is a website with a photo of Thomas the Tank Engine. Looking at the square engine, perhaps a match box

    asked by jessica on December 29, 2006
  7. Physics

    It is observed that 55.50 mL of water at 20 ∘C completely fills a container to the brim. When the container and the water are heated to 60 ∘C, 0.37 g of water is lost. Density of water at 60 ∘C is 0.98324 g/mL. What is the coefficient of volume

    asked by Marthin on January 21, 2018
  8. Chem

    A student was performing an extraction procedure of o-Xylene from water into octanol. The total mass of o-Xylene was 0.10 gram (molecular weight 106.2 g/mole). The volume of water was 990mL and volume of octanol 10 mL. There is a head space of 200 mL above

    asked by Sahara on August 1, 2013
  9. please help me guys physical sciences

    1.an engine develops 65kW over a period of 20minutes. The engine uses 5kg of petrol. Calculate the following:- A. The heat gegenerated B. The power generated by the petrol C. The efficiency Of the engine 2.A square steel plate with sides of 12cm long, is

    asked by Bettina on March 1, 2015
  10. Please help asap science

    1.an engine develops 65kW over a period of 20minutes. The engine uses 5kg of petrol. Calculate the following:- A. The heat gegenerated B. The power generated by the petrol C. The efficiency Of the engine 2.A square steel plate with sides of 12cm long, is

    asked by Bettina on February 27, 2015
  11. math

    A fish tank is 50 cm long, 34 cm wide and 24 cm high. It contains water to depth of 18 cm. Four identical spheres are placed in the tank and are fully submerged. The water level rises by 4.5 cm. 1.What is the volume before the spheres were added? 2. What

    asked by Lindsay on November 29, 2012
  12. statistics

    An automobile shop manager times six employees and found that the average time it took then to change a water pump was 18 minutes. The SD of the sample was 3. Find the 99% of the interval of the true mean.

    asked by katelyn on March 6, 2011
  13. Chemistry

    7.0 ml of 6.0 M NaOH are diluted with water to a volume of 400 ml. You are asked to find the molarity of the resulting solution. The total number of moles of NaOH is not changed on dilution. Calulate the molarity. Work: (6)(.007)=(x)(.4) x=.105M Thanks for

    asked by Anonymous on April 20, 2007
  14. Physics

    During an all-night cram session, a student heats up a one-half liter (0.50 10-3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 19°C, and the beaker is filled to the brim. A short time later when the student returns, the

    asked by Mary on April 13, 2007
  15. physics.

    Heat engine X takes four times more energy by heat from the hot reservoir than heat engine Y. Engine X delivers two times more work, and it reject seven times more energy by heat to the cold reservoir than heat engine Y. Find the efficiency of heat engine

    asked by jean on April 26, 2007
  16. Math

    Calculate the amount of fluorescein (MW 332.31) you will need to make 10 mL of 15 mM solution in ethanol (EtOH). My answer:0.05 g 2.Using Equation C1V1=C2V2 calculate the volume of stock solution (15 mM) you need to make 1 mL of each working solution

    asked by Vivian on January 14, 2017
  17. Chemistry

    Hey, for chemistry class we are given days in the lab to conduct an experiment, then answer a number of questions that correlate with that experiment and how we can make use of it. This week we looked at the Molar Fusion of Ice and there are some questions

    asked by Cody on December 16, 2008
  18. physics

    An engine has a hot reservoir of 520K and a low temperature reservoir of 330K. What is the theoretical efficiency of this engine? Answer in units of %

    asked by Bob on February 11, 2009
  19. Physics

    A train consists of two carts and an engine. If m = 1000 kg, and the train is moving with an acceleration of 5.5 m/s2, find the tensions between the engine and the middle cart.

    asked by 7861 on June 11, 2012
  20. physics

    Consult Multiple Concept Example 10 in preparation for this problem. Traveling at a speed of 18.7 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is

    asked by Daman on October 21, 2012
  21. Phyical science

    A fire engine is rapidly approaching the corner. Explain what happens to the frequency of the sound wave as the fire engine draws closer. What do you hear? Can some please help

    asked by Kayla on December 4, 2015
  22. Physics

    A heat engine is 20% efficient. If it loses 800 J to the cooling system and exhaust during each cycle, the work done by the engine is: 200 J 1000 J 800 J 20 J

    asked by Steve on May 8, 2015
  23. physics

    An engine absorbs 2000J of heat from a hot reservoir and expels 750J to a cold reservoir during each operating cycle. What is the efficiency of the engine?

    asked by me on April 13, 2012
  24. physics

    A 40%-efficient car engine accelerates the 1300 kg car from rest to 20 m/s How much energy is transferred to the engine by burning gasoline? .

    asked by andrea on November 13, 2010
  25. moles of water produced?

    We mixed HCl and NaOH into water and got this table, all for trial 1 Here is all of the info for trial 1: trial 1: volume of 2 M NaOH used: 50.0 mL initial temperature of NaOH: 24.4 degrees C volume of 2 M HCl used: 50.0 mL initial temperature of HCl: 24.3

    asked by Abdullah on March 12, 2010
  26. physics

    A steam engine’s boiler completely converts 151 kg of water to steam. This process in- volves the transfer of 4.8786 J J as heat. If steam escaping through a safety valve does 1.66 × 108 J of work expanding against the outside atmosphere, what is the

    asked by scott on February 20, 2013
  27. Chemistry

    Question: if you added ethylene glycol to your car's radiator to lower the freezing point to -31.0 degree C, what would the corresponding boiling point of the coolant in your radiator. The freezing point and boiling point constants for water are 1.86 and

    asked by eliz on March 17, 2009
  28. chemistry

    1. Ideal gas particles: A. have no mutual attraction and no individual volume. B. have no mass or volume. C. have no odor and no color. D. have no density and do not form bonds. Is it A? 2. Why does the density of gas in a hot air balloon decrease as the

    asked by Cortney on March 18, 2015
  29. Physics

    A 295kg box is pulled at a constant speed by the little engine. The box moves a distance of 2.8 m across the horizontal surface. (μ=.20) How much energy is transferred by the engine? (How much WORK is done?)

    asked by Anonymous on March 14, 2014
  30. physics

    engine falls from sky at a horizontal speed of 280 m/s and a altitude of 4500, whats horizontal distance the engine will travel before it hits the ground

    asked by terrance on February 2, 2011
  31. Physics

    A reversible heat engine operates between thermal reservoirs at 1000 K and 290 K. If 8610 J is extracted from the hot reservoir, how much work is done by the heat engine?

    asked by Jon on December 9, 2011
  32. Physics

    an empty truck weighs 4000N its engine can produce an accelerationof 1m/sif the truck is loaded with 2000N, find the acceleration the engine can prodeuce?

    asked by syed on September 1, 2015
  33. Chem

    mass of empty cylinder is 87.470g 97.470g w/10mL of water 107.470g + 10mL of water 117.470g + 10 more mL of water need to know the total volume of water (in mL or cm3) total mass of water density of water calculate the average of the 3 densities of water.

    asked by dra on June 20, 2010
  34. Maths

    A water tap fills at the rate of 25 litre per minute into a water tank another water tap can fill water in the same tank at the rate of 15 litres per minute if both the water taps are opened then the water tank is filled in 15 minutes find the volume of

    asked by Tanushree on September 18, 2016
  35. physics

    If 250 joules of work are performed by an engine using 600 joules of energy in 5 seconds, what is the efficiency of the engine?

    asked by anonymous on October 30, 2014
  36. social studies

    What were the 5 scientific discoveries of the Industrial Revolution? I already hae the steam engine and a boat powered by the steam engine.

    asked by Anya on September 29, 2009
  37. Physics

    The drawing shows a jet engine suspended beneath the wing of an airplane. The weight W of the engine is 12000 N and acts as shown in the drawing. In flight the engine produces a thrust T of 54200 N that is parallel to the ground. The rotational axis in the

    asked by Annie on October 21, 2012
  38. physics

    In a particular crash test, an automobile of mass 1369 kg collides with a wall and bounces back off the wall. The x components of the initial and final speeds of the automobile are 10 m/s and 1.9 m/s, respectively. If the collision lasts for 0.18 s,

    asked by Anonymous on December 23, 2012
  39. Physics

    In a particular crash test, an automobile of mass 1295 kg collides with a wall and bounces back off the wall. The x components of the initial and final speeds of the automobile are 25 m/s and 1.5 m/s, respectively. If the collision lasts for 0.11 s, find

    asked by monica :) on February 2, 2015
  40. Physics

    A 1480 kg automobile has a wheel base (the distance between the axles) of 2.9 m. The center of mass of the automobile is on the center line at a point 1.34 m from the front axle. Find the force exerted by the ground on each back wheel. The acceleration of

    asked by DW on November 9, 2013
  41. physics

    A coolant fluid has a latent heat of evaporation of 234 kj/kg . If the pump rate is 2250g per minute. How much thermal heat is removed each hour?

    asked by Aliya on November 7, 2014
  42. physics

    A coolant fluid has a latent heat of evaporation of 234 kj/kg . If the pump rate is 2250g per minute. How much thermal heat is removed each hour?

    asked by Aliya on November 9, 2014
  43. physics

    A duck is floating on water with 26% of its total volume submerged below the surface. If the duck has a mass of 2.6kg, what is the duck’s total volume? You must show all necessary work, the density of water is 1000kg/m3.

    asked by Joe on November 4, 2012
  44. chem

    how much water would you need to add to 20.0 mL of 2.0 M NaCl to make a 0.10 M solution? try the formula c1V1 = c2V2 (where c1 is the initial concentration, V1 is the initial volume, c2 is the diluted concentration and V2 is volume you are trying to find)

    asked by beckii on May 23, 2007
  45. physics

    A Carnot engine operates between 170°C and 20°C. How much ice can the engine melt from its exhaust after it has done 6.0 104 J of work? i need a step by step process. you don't have to give me the answer.

    asked by Nate on September 29, 2010
  46. Physics

    A car engine is initially rotating at 180 rad/s. It is then turned off and takes 1.20 s to come to a complete stop. What is the angular acceleration of the engine? Assume acceleration is constant.

    asked by Alex on May 31, 2012
  47. Physics

    A reversible engine converts 1/6 of the heat input into work. When the temperature of the sink is reduced by 62C, the efficiency of the engine is doubled.What are the temperarure of the source and sink?

    asked by Tulika on April 19, 2012
  48. Physics

    An engine has a hot reservoir of 520K and a low temperature reservoir of 330K. What is the theoretical efficiency of this engine? Answer in units of % I got 36.5% but the teacher is saying that's wrong!! Please help with calculation.

    asked by Bob on February 12, 2009
  49. Statistics

    A marketing researcher decides to test whether coffee drinkers have a favorable view of coffee labeled as “Fair Trade.” He has 15 randomly selected coffee drinkers taste his company’s Morning Blend, then the exact same coffee labeled Fair Trade

    asked by John on March 24, 2016
  50. math

    A cylindrical container has a volume of 226 cubic inches. the container is filled 3/4 of the way with water. To the nearest cubic inch, what is the volume of water in the container? How many more cubic inches of water is needed to fill the container?

    asked by sandy on December 6, 2012
  51. Physical Chemistry

    A mole of air (80% Nitrogen, and 20% Oxygen by volume) at 298.15K is brought into contact with liquid water which has a vapor pressure of 3168Pa at this temperature. a) what is the volume of the dry air if the pressure is 1 bar? b) what is the final volume

    asked by Nate on February 7, 2012
  52. Dr vsec

    The density of water of ice is 0.917gm/cm-3 and the density of sea water is 1.03gm/cm-3.calculate the ratio volume of ice outside to the volume of ice which is inside the sea water

    asked by Anant shukla on November 23, 2015
  53. chemistry thermodynamics

    calculate the w, q, delta H, and delta U for the process in which 1 mol of liquid water at 373 K undergoes the transition to gas phase water at 406 L. the volume of liquid water at 373K is .98 x 10^-5 m^3/mol and the volume of steam at 373 and 460 K is

    asked by romell on February 28, 2011
  54. physics

    18g of liquid water is placed in a flexible bag, the air is excluded, and the bag is sealed. It is then placed in a microwave oven where the water is boiled to make steam at 100C. What is the volume of the bag after all the water has boiled? Assume that

    asked by ana on November 19, 2009
  55. chemistry

    The total pressure in a 11.3 L automobile tire is 44 psi at 11°C. By how much does the pressure in the tire rise if it warms to a temperature of 29°C and the volume remains at 11.3 L?

    asked by HELP on February 10, 2011
  56. Physics

    A 254kg box is pulled at a constant speed by the little engine. The box moves a distance of 3.0 m across the horizontal surface. (μ=.20) How much energy is transferred by the engine? (How much WORK is done?) what is the answer in joules?

    asked by help on February 13, 2014
  57. Physics

    A heat engine exhausts 3 000 J of heat while performing 1 500 J of useful work. What is the efficiency of the engine?

    asked by JJ on December 19, 2010
  58. physics

    A heat engine has a hot reservoir of 680°C and a cold reservoir of 220°C. What is the efficiency of the engine?

    asked by hana on June 6, 2014
  59. Physics

    A heat engine has a hot reservoir of 680°C and a cold reservoir of 220°C. What is the efficiency of the engine?

    asked by Anonymous on May 20, 2014
  60. physics

    A 425 g model rocket is accelerated upward at 86 m/s2 by its engine. What is the value of the force exerted by the engine on the rocket?

    asked by Rose on January 27, 2015
  61. physics

    A heat engine has a hot reservoir of 680°C and a cold reservoir of 220°C. What is the efficiency of the engine?

    asked by Erika on September 20, 2012
  62. chemistry

    Calculate the volume of solution that has a vapour pressure of 25.8 mbar and contains 200.3 g of galactose, C6H12O6, at a temperature of 22.0 °C. The vapour pressure of pure water at 22 °C is 26.40 mbar, the density of water is 1.00 g mL-1, and assume no

    asked by Jane Smith on June 5, 2015
  63. Chemistry Please Help Thanks!

    Calculate the volume of solution that has a vapour pressure of 25.8 mbar and contains 200.3 g of galactose, C6H12O6, at a temperature of 22.0 °C. The vapour pressure of pure water at 22 °C is 26.40 mbar, the density of water is 1.00 g mL-1, and assume no

    asked by Ben on June 4, 2015
  64. Physics

    A carnot’s engine with air as working substance is initially at 3270C and pressure of 12 atmospheres. The volume is one litre to start with. The expansion or compression ratio is 1:6. Find the lowest temperature and efficiency. (γ= 1.4)

    asked by Avaneesh Narayan Singh on December 12, 2016
  65. Physics

    arnot’s engine with air as working substance is initially at 3270C and pressure of 12 atmospheres. The volume is one litre to start with. The expansion or compression ratio is 1:6. Find the lowest temperature and efficiency. (γ= 1.4)

    asked by Avaneesh Narayan Singh on December 12, 2016
  66. advance physics

    A carnot’s engine with air as working substance is initially at 3270C and pressure of 12 atmospheres. The volume is one litre to start with. The expansion or compression ratio is 1:6. Find the lowest temperature and efficiency. (γ= 1.4)

    asked by anil on March 19, 2017
  67. physics

    an objectfloats in water with 3/4 its volume below the surface of the water. if the volume of the object is 1 m^3, what is the mass of the object?

    asked by john on March 21, 2010
  68. moles/solutions.

    I have three questions. The first one I got an ansser of 6.02 X 10^23. The question is this. How many molecules of sucrose (C-12,H-22, O-11) molecular weight, 342, would be present in one mole of sucrose? The other two questions I have are related. A) The

    asked by sarah on September 17, 2006
  69. math

    Tasha collected another set of data values, and used a calculator for the engine speed and horsepower data. She got an equation for the least-squares line: ŷ = 10 + 30x. If Tasha uses this equation to predict horsepower from engine speed, the horsepower

    asked by Maragret on October 24, 2014
  70. science

    a carnot engine is designed to operate between 480K and 300K.if the engine actually produces 1.4j of mechanical energy per calorie of heat absorbed,then the ratio of actual efficiency to theoretical efficiency is

    asked by hari on September 7, 2016
  71. Honors Chemistry

    An automobile gasoline tank holds 45 kg of gasoline. When the gasoline burns, 158 kg of oxygen are consumed and carbon dioxide and water are produced.What is the total combined mass of carbon dioxide and water that is produced?

    asked by SA on September 19, 2017
  72. math, bobpursly

    I don't know what the -4)colors means. Models*exterior colors*upholsterytypes*numberinteriour colors. Multiply them out. what do i have to do to solve for this one i have no idea i was low on the first try... An uto mobile manufacturerr produces 7 models,

    asked by bobpursley on July 6, 2007
  73. physics

    A cylindrical brass container with a base of 80.0 cm^2 and height of 20.0 cm is filled to the brim with water when the system is at 25.0° C. How much water overflows when the temperature of the water and the container is raised to 96.1° C? (The

    asked by Romy on April 23, 2012
  74. Calculus

    Consider a hemispherical bowl with a radius of 12 cm. The bowl contains water to a depth of 9 cm. The density of the water at any point x cm below the surface of the water is given by 2e^(0.15x) g/cm^3. A. Find the volume of the water in the bowl. B. Find

    asked by Roy on May 16, 2018
  75. Physical Chemistry

    Calculate the difference between H and U when 1 mole of water is boiled at 373 K and 1 atm. The volume of 1 mole of perfect gas at 373 K is 0.03 m3 and the volume of liquid water may be neglected. (1 atm = 105 N m-2) what equations should be used ?

    asked by S on September 2, 2015
  76. chemistry

    The volume of a sample of a gas collected over water at 32 Celsius and 752 torr is 627 ml. What will the volume of the gas be when dried and measured at STP? (Vapor pressure of water at 32 Celsius = 35.7 torr)

    asked by Cory on May 1, 2013
  77. Chemistry

    The volume of a sample of a gas collected over water at 32 Celsius and 752 torr is 627 ml. What will the volume of the gas be when dried and measured at STP? (Vapor pressure of water at 32 Celsius = 35.7 torr)

    asked by Ken on December 7, 2016
  78. conversion problems

    Im not sure how to convert these because of the cm cubed heres the question: An aluminum engine block has a volume of 4.88 L and a mass of 12.60 kg. What is the density of the aluminum in grams per cubic centimeter? so its gonna be something g/cm3 can you

    asked by Hannah on August 25, 2010
  79. Physics

    The rate of volume flow of water through a canal is found to be a function of cross -section of canal and velocity of water.show that the rate of volume flow is proportional to the velocity of flow of water

    asked by paramjeet on August 4, 2014
  80. Maths

    A swimming pool is being emptied and the amount of water remaining in the pool after t minutes after emoting commences is given by: Time t (min) Volume V (L) 0 30000 20 28800 40 25200 60 19200 80 10800 Find the equation describing the volume of water

    asked by Amelia on October 30, 2016
  81. Calculus

    A water tank is made by rotating f(x)=2^x-1 between [0,2] about the y-axis. The water tank is initially full, when a hole is opened at the bottom tip so that the water drains at a rate of 4 unit^3/second. How fast is the height of the water decreasing when

    asked by Henry on January 8, 2016
  82. Math/College Algebra

    A water trough with triangular ends is 9ft long, 4ft wide, and 2ft deep. Initially the trough is full of water, but due to evaporation, the volumn of the water decreases at a rate proportional to the square root of the volume. Using advanced concepts from

    asked by Debi on September 7, 2008
  83. Physics

    Coefficient of volume expansion of some liquids(a/˚C) Alcohol=1.1x〖10〗^(-4) Glycerin=5.0x〖10〗^(-4) Water=3.7x〖10〗^(-4) Ether=1.63x〖10〗^(-4) Mercury= 1.1x〖10〗^(-4) How much water overflows when a pyrex vessel filled to the grim with 1

    asked by Angela on December 8, 2013
  84. chemistry(Bsc)

    HI i am not able to get the answer, can you help please...Here is the quest. At 700K and 300 atm, the density of water vapour is 0.188g/cm3. Evaluate the compression factor for water volume in this state. Molar heat of water=0.018016KJ/mol.

    asked by joys on September 21, 2009
  85. Physics

    A mass of 4.77 kg of chilled water at 0C is placed in a freezer which is kept at −19.2C. Approximately how much electric energy is needed to operate the compressor to cool this water to −19.2 C if the room temperature is maintained at 24.2C? The

    asked by physicshelp on January 13, 2013
  86. chemistry

    A 2.500×10−2M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.3mL . The density of

    asked by Jason on May 24, 2015
  87. chemistry

    A 2.500×10−2M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.3mL . The density of

    asked by Jason on May 24, 2015
  88. algebra

    Your automobile radiator contains 15 quarts of an antifreeze mixture. A test shows the mixture is 40% antifreeze and 60% water. The owner's manual says the mixture should be 50% antifreeze and 50% water. How much of the mixture should be removed and

    asked by May on November 8, 2017
  89. science

    Calculate the volume of solution that has a vapour pressure of 25.8 mbar and contains 200.3 g of galactose, C6H12O6, at a temperature of 22.0 °C. The vapour pressure of pure water at 22 °C is 26.40 mbar, the density of water is 1.00 g mL-1, and assume no

    asked by Jane Smith on June 5, 2015
  90. Physics

    An automobile moving at a constant velocity of 15m/s passes a gasoline station. Two seconds later, another automobile leaves the gasoline station and accelerates at a constant rate of 2m/s^2 in the same direction. How soon does the second autombile

    asked by Abbie on August 9, 2011
  91. History

    My question was pretaining to the culture of the 1920's. I need to the question answered in what ways did the automobile change American culture during the 1920's? Henry Ford came out with the Model T and how was he able to succeed to a degree far beyond

    asked by David on March 17, 2011
  92. maths

    the volume of water in a tidal pool is given by the formula V = 2cos (3pi/x ) where x is the depth of water in the pool. Find the water at which the depth of the pool will be increasing when the volume in the pool is increasing at the rate of 12 cubic

    asked by Michelle on July 15, 2012
  93. physics

    How large a pressure increase (in ATM) must be applied to water if it is to be compressed in volume by 1%? The bulk modulus of water is 2 ~ 10^9 N/m^2 and 1 ATM = 10^5 N/m^2 I think that it is P = bulk modulus * 0.01 because 1/100 = 0.01, which is 1% of

    asked by Charlie on December 11, 2008
  94. thermal physics

    An automobile tire has a volume of 1.60 x 10-2 m3 and contains air at a gauge pressure (pressure above atmospheric pressure) of 167 kPa when the temperature is 0.00°C. What is the gauge pressure (in kPa) of the air in the tires when its temperature rises

    asked by sweety on April 2, 2009
  95. math

    an insurance company reported that 55% of all automobile damage claims were made by people under age 25. If six automobile damage claims were selected at random, determine the probility that exactly four of them were made by someone under ager 25.

    asked by EJ on May 17, 2014
  96. Chemistry

    For my chemistry lab, I reacted Mg powder with HCl to create H2 gas. I measured the volume of H2 gas created by salt water displacement by reading off an inverted test tube. I measured 14.0 mL and calculated the percent yield (used PV=nRT to find

    asked by Winnie on September 23, 2017
  97. Physics-Thermo

    Imagine a 600 g of water at 70oC in a piston-cylinder device. Initially, the 9-kg, 13-cm diameter piston rests on two stops such that the water occupies a volume of 0.2 m3. Heat is transferred to the system until the water is completely vaporized. Take the

    asked by sara on March 26, 2012
  98. math

    Sarah Meeham blends coffee for Tasi-Delight. She needs to prepare 140 pounds for blended coffee beans selling for $5.07 per pound. She plans to do this by blending together a high-quality bean costing $6.50 per pound and a cheaper bean at $2.50 per pound.

    asked by Danny on July 14, 2015
  99. Physical Chemistry

    Assuming that the osmotic pressure of a sample of sea water at 10 C is 25.5 atm, calculate the work required under reversible conditions at this constant temperature to prepare 9 litre of pure water from this sea water. (Take the available volume of sea

    asked by Nicole on February 24, 2011
  100. Bio1100

    a 17g object dropped in water makes the volume rise from 6 to 20 ml: what is its volume, what is its density?

    asked by michael on June 20, 2012