1. chemistry

    Relationship between the pressure and volume of helium gas at a constant temperature of 298K. Volume was changed by moving a piston & following data was obtained: Vol (L) Pressure (atm) 5 10.229 10 4.749 15 3.198 20 2.381 30 1.665 50 0.98 75 0.655 100 0.47

    asked by Anonymous on August 29, 2010
  2. Chemistry

    A 0.3120 g sample of a compound made up of aluminum and chlorine is dissolved in 150 mL H2O. When excess AgNO3 is added, 1.006 g of AgCl is precipitated. What is the number of moles Cl in the aluminum chloride sample?What is the number moles of aluminum in

    asked by Anonymous on October 5, 2012
  3. physics

    A sealed tank containing seawater to a height of 11.0 m also contains air above the water at a gauge pressure of 3.00 atm. Water flows out from the bottom though a small hole. Calculate the speed with which the water comes out of the tank. I believe this

    asked by Sarah on December 8, 2009
  4. chemistry

    the vapor pressure of ethanol at 20c is 44 mmHg and the vapor pressure of methanol at the same temperature is 94mmHg. A mixture of 30.0 g of methanol and 45.0 g of ethanol is prepared (and can be assumed to behave as an ideal solution). a.) calculate the

    asked by cassidy on January 30, 2012
  5. chem

    so i posted this question yesturday and got some help. which is the stuff below. can you look at the last thing i said which was the answer i got by doing what DrBob222 said to do and tell me if its correct.(the question is the first section) thanks chem -

    asked by hannah on November 10, 2010
  6. chemistry

    Hey, I am having a real hard time getting the answers to the problems. Any help would be greatly aprreciated! 1. When 11 mL of a solution containing 2.9 M AlBr3 is diluted to 33 mL, a dilute solution is formed. What is the Br- concentration in 25 mL of the

    asked by chelsea on November 7, 2007
  7. Chemistry

    Explain what happens when you add sodium chloride to boiling water. I know that when sodium chloride is added to water, the boiling point of water increases. What happens when it is added to already boiling water? I know it increases the temperature, I

    asked by Mercedes on January 31, 2007
  8. Physics

    1.A brass wire 80 cm long and 0.3 cm in diameter is used to hang an object weighing 6.5 x 10 ^5 dynes. Find stress, strain and young's modules. 2. To one end of a wire 1.2 m long and 0.4 cm in diameter is hung on object with a mass of 10 kg. The wire is

    asked by Midnight on September 3, 2014
  9. thermodynamics

    a gas initially at 10000kPa is undergoing a reversible process in which its pressure gas doubled at a constant volume of 0.5m^3. if the total internal energy of the in kJ related to the pressure P in kPa and total volume in m^3 according to u=2PV calculate

    asked by Zipho on March 21, 2017
  10. Physics

    A Jaguar XK8 convertible has an eight-cylinder engine. At the beginning of its compression stroke, one of the cylinders contains 499 cm ^ 3 of air at atmospheric pressure (1.01\times 10^5 Pa}) and a temperature of 27.0 degrees C. At the end of the stroke,

    asked by Natalie on November 12, 2012
  11. thermodynamics

    0.5 kg of saturated vapor is contained in a closed system with pressure of 10 bar is cooled at constant volume until pressure decreases to 5 bar. Determine heat transfer and sketch the process in a P-v and T-v diagram answer = -473.35 kJ(heat is

    asked by shasha on April 16, 2012
  12. Atmospheric Science

    The 15th floor meteorological observatory of the O&M building is 188 ft from the level of the main entrance. Assume that the temperature at the entrance is 25 degrees Celcius, that station pressure is 1000 mb, and the mixing ration is .010 kg/kg. What is

    asked by Sandra on November 11, 2009
  13. Physics

    An oxygen tank of volume V is stored in a medical laboratory. Initially, the tank is full of compressed oxygen at pressure p_{0} . Lab regulations require a refill when the pressure in the tank drops to p_{2} so as to avoid contaimination by impure gas.

    asked by Anon. on September 23, 2013
  14. Physics

    A basketball is thrown horizontally with an initial speed of 4.20 m/s. A straight line drawn from the point to the landing point makes an angle of 30.0 with the horizontal. what was the release height?

    asked by Sean on March 13, 2008
  15. math

    The following data set gives the difference between the winning and losing scores in 50 randomly observed highschool basketball games: 2, 12, 1, 2, 12, 5, 14, 2, 45, 9, 1, 8, 18, 28, 9, 4, 30, 16,4, 12, 8, 13, 20, 9, 17, 13, 49, 17, 13, 4, 14, 2, 12, 29,

    asked by KiKi on March 29, 2010
  16. Math

    Which would you measure in kilograms? A. the mass of a butterfly B. the capacity of a bottle C. the mass of a basketball D. the length of a river I personally think it's D. I've seen the other questions that are similar just that C. isn't the same answer

    asked by Ms.Sue pls help me on March 17, 2019
  17. MATH

    all 500 students at robinson junior high were surveryed to find their favorite sport how many more students played football than basketball? a. 325 b. 135 c. 190 d. 55

    asked by hi on March 2, 2019
  18. Algebra 1

    Average attendance at a school's basketball games increased from 1000 to 1500 last year. One student said that represented a 150% increase. Explain the student's error. Please help!

    asked by Nicolette on January 24, 2016
  19. chemistry

    In a soda acid fire extinguisher, concentrated sulfuric acid reacts with sodium hydrogen carbonate to produce carbon dioxide, sodium sulfate and water. How many moles of sodium hydrogen carbonate are produced from a reaction of 0.4 moles of sulfuric acid?

    asked by student_14579 on January 19, 2015
  20. Science, please check my answer Ms Sue!

    How does a hurricane form? a.)It forms over a warm ocean water as a low-pressure area*** b.) it forms over a warm ocean as a high-pressure area. c.) it forms over cool ocean water as a low-pressure area d.) it forms over a cool ocean water as a

    asked by Carla on May 14, 2015
  21. Chemistry

    A balloon filled with 0.01 mol of hydrogen gas is kept constant at 25 degrees Celsius. If the pressure is increased from 1atm to 1.5atm, what is the resulting volume? _______________________________________ C3H8(g) + 5 O2(g)-->3 CO2(g) + 4 H2O(g) A 0.03

    asked by Muffin on December 21, 2006
  22. Biology

    Supposing you have a renal stenosis, what kind of affect does that have on the heart. What I do know: - decreased flow to the kidneys - kidneys assumes that overall blood volume have decreased - RNN system is activated - = increase in blood pressure

    asked by Lena on February 5, 2011
  23. chemistry

    A student generates H2(g) over water using the reaction between zinc and hydrochloric acid Zn(s)+ 2HCl(aq)---> ZnCl2(aq)+ H2(g) Data: Mass of vial and zinc 15.5082 mass of vial 15.3972 mass of zinc 0.111 final burette reading 45.30mL barometric pressure:

    asked by Yuli on November 23, 2011
  24. math

    Class has 28 students. 23 like basketball. Also, 15 like baseball. 12 like both. How many students do not like either.

    asked by Tracey on March 29, 2011
  25. Physics please check

    As you climb a mountain, your ears "pop" because of the changes in (a) In which direction does your eardrum move as you climb up? inward outward eardrum does not move Give your reasoning. I think the eardrum moves outward because the further you go away

    asked by Mary on April 9, 2007
  26. Chemistry

    What is the total pressure of gas in a propane tank if propane has a partial pressure of 33.1 atm, nitrogen’s is 1.11 atm, and oxygen’s is 0.27 atm?

    asked by Anonymous on May 15, 2018
  27. chemistry

    a 10.0L ballon contains helium gas at a pressure of 655mmHg, what is the new pressure, in mmHg, of the helium gas at 20.0L, if no change in temp or amount of gas

    asked by shaun on March 1, 2012
  28. chem.

    A sample of argon at 300. °C and 50.0 atm pressure is cooled in the same container to a temperature of 0. °C. What is the new pressure? 105 atm 45.5 atm 54.9 atm 23.8 atm 42.7 atm

    asked by Anonymous on September 29, 2009
  29. Chem

    To a tank already containing N2 at 2.0 atm and O2 at 1.0 atm, we add an unknown quantity of CO2 until the total pressure is 4.6 atm. What is the partial pressure of the CO2?

    asked by Stacy on October 11, 2012
  30. chemistry

    hydrogen gas is collected in a bottle, and the pressure of the gas is 892 torr at 24 °C. what is the pressure of hydrogen gas when the temperature decreases to 20 °C?

    asked by Lynn on November 30, 2010
  31. Chemistry

    A mixture of gases contains 2.00 mol of O2, 3.00 mol of N2, and 5.00 mol of He. The total pressure of the mixture is 850 torr. What is the partial pressure of each gas?

    asked by Alexis on December 10, 2012
  32. Physics

    By how much does the air pressure in a house increase if the house is sealed and the air temperature increases from 10.7° C to 21.0° C? The initial air pressure is 1.00 atmosphere.

    asked by Dave on December 8, 2015
  33. chem

    To a tank already containing N2 at 2.0 atm and O2 at 1.0 atm, we add an unknown quantity of CO2 until the total pressure is 4.6 atm. What is the partial pressure of the CO2?

    asked by stac on October 11, 2012
  34. Math

    one way to resize a ring is to fill a bar into the ring.suppose a ring that is 20 mm in diameter has to be resized to fit a fingure 16 mm n diameter what is the length of the bar that should be inserted in order to make the ring fit the fingure? ( Hint:

    asked by Diala on November 28, 2010
  35. math

    one way to resize a ring is to fill a bar into the ring.suppose a ring that is 20 mm in diameter has to be resized to fit a fingure 16 mm n diameter what is the length of the bar that should be inserted in order to make the ring fit the fingure? ( Hint:

    asked by ???? on May 2, 2011
  36. Chemistry

    Reactions in bomb calorimeters occurs at constant volume while the coffee cup calorimeter has reactions occurring at constant pressure. If one was to perform identical experiments in both of these instruments (one at constant volume and the other at

    asked by Anonymous on January 27, 2018
  37. chemistry

    A piece of nickel foil, 0.550 mm thick, 1.25 cm width and 1.00 cm long, is allowed to react with fluorine, F2 to give a nickel fluoride. Density of nickel is 8.908 g/cm3. How many moles of nickel foil were used? If you isolated 1.261 g of nickel fluoride,

    asked by Sarah on November 12, 2008
  38. MATH

    Isopropyl alcohol, C3H8O, is used in rubbing alcohol mixture. Alcohol on the skin cools by evaporation. How much heat(in kJ) is absorbred by the alcohol of 2.25g EVAPORATED? THE HEAT VAPORIZATION OF Isopropyl alcohol is 42.1 kJ/MOL Compute the number of

    asked by LEO on June 11, 2007
  39. Science

    Proteins found on the outside of cells and viruses are called ____________ , these are used by the body to _______________ pathogens. antigens; help antibodies; make antigens; identify antibodies; reproduce Identify the response below that summarizes the

    asked by Brooke J. on February 22, 2013
  40. Chemistry HELP!!!

    Only one question, it would be greatly appreciated if you would help me Thanx In an experiment, Na2CO3(aq) was added to 25.0 mL of CaCl2(aq) solution until no more precipitate was formed. The mass of precipitate produced was 2.50 g. Some statements about

    asked by Brittany Rusk on September 28, 2006
  41. physics

    An 80 kg crate was slowed to a stop when a frictional force of 160 Newtons was applied. It was originally traveling at 5.5 m/s. What distance did the box travel before it came to a stop? m. Round to first decimal.

    asked by blah on May 20, 2013
  42. Math

    How long will it take a passenger train traveling at 160 miles per hour to travel from Denver, Colorado to Lincoln,Nebraska? The distance between the two cities is 488 miles

    asked by Kim on November 4, 2018
  43. statistics

    f someone scored two Standard Deviations above the Mean on a standardized test where the Mean = 100 and the Standard Deviation = 15, then that person’s numerical score would be…? A. 125 B. 130 C. 160 D. 90th Percentile

    asked by Annie on February 20, 2012
  44. physics

    An airplane is flying horizontally with a constant velocity of 160 m/s at an altitude of 5400 m when it drops a package. How far ahead of the target along the x direction should the plane be when it releases the package?

    asked by kb on February 25, 2009
  45. Grade 3 math

    Never thought I would have a problem with Gr. 3 math - lol - but it goes like this. Write the addition or subtraction fact you will use to calculate each answer. Then add or subtract. 70 50 120 160 +30 +60 -30 -80 My question is what would the fact be???

    asked by rebecca on December 30, 2007
  46. math

    a man buys an item from delhi 10% cheaper than that at merath, incurs loss of rs. 160, but on selling the item profits rs.240. calculate the profit percentage.

    asked by alex on October 30, 2011
  47. physics ASAP please

    In a rugby match 3 players huddle around a fourth player and push him. If they push with the following forces, what is the resultant force on him? 160 N 125, 140 N 35, and 220 N 200

    asked by Lesley on September 26, 2011
  48. physics

    With what minimum speed must you toss a 160 ball straight up to hit the 15 -high roof of the gymnasium if you release the ball 1.7 above the ground? Solve this problem using energy.

    asked by Dan on October 12, 2009
  49. Science - Chemistry

    Aluminum oxide is formed from the reaction of metallic aluminum with oxygen gas. How many moles of Aluminum are needed to form 3.4 moles of Aluminum oxide? Writr the equation and balance it. 4Al + 3O2 ==> 2Al2O3 The equation tells you that 4 mols Al are

    asked by Sara on January 23, 2007
  50. physical science

    If the absolute pressure of a gas is 550.280 kPa, its gage pressure is A. 101.325 KPa B. 277.280 KPa C. 448.955 KPa D. 651.605 Kpa

    asked by Josh on December 2, 2007
  51. Math

    Two numbers that have a sum of 28 and a product of 160. What are the two numbers?

    asked by Freddie on February 5, 2013
  52. Mathematics

    I lost 3/4 of my money and had $160 left. How much money did I have before?

    asked by Raeana on November 13, 2014
  53. math

    There are 160 patients. 3 of 4 patient gets BP check, how many of them need check?

    asked by Jonny on March 30, 2016
  54. Math

    Two numbers are in the ratio 20:12. Their sum is 160. What are the two numbers?

    asked by Sidney on February 16, 2016
  55. chemistry

    How many mL of 4.50 M NaOH must be diluted to produce 160.0 mL of 2.50 M NaOH?

    asked by jade on February 27, 2012
  56. Chemistry

    Calculate the pressure of the dry gas collected over water at 10 degree celcius and 750mmHg. Given that the vapour pressure of water at 10 degree celcius is 20mmHg

    asked by Dolapo on February 7, 2016
  57. science

    An aerosol can contains gases under a pressure of 4.6 atm at 18◦C. If the can is left on a hot sandy beach, the pressure of the gases increases to 4.69 atm. What is the Celsius temperature on the beach

    asked by darla on March 9, 2014
  58. chem

    A sample of fluorine has a volume of 3.6 L when the temperature is 112.3 degC and the pressure is 922 torr. What will be the volume when the pressure is 88.48 kPa and the temperature is 140.4 degC?

    asked by zach on March 28, 2008
  59. Chem

    In an experiment, 25.0 ml of a gas with a pressure of 1. atm is contained in a balloon at 25.0 c. The Balloon is then cooled to 5.0 c, and the pressure is found to be .750 atm. What is the volume of the gas under the new conditions?

    asked by Chris on June 29, 2011
  60. earth

    an area of high pressure is referred to as a anticyclone, and an area of low pressure is called a cyclone. is percipitation generally accosiated with a cyclone or anticyclone?

    asked by taylor on May 12, 2008
  61. Chem...

    1) what is the density of methane (CH4) at a temp. of 20C and a pressure of 684mm. 2) a gas has a density of 2.5g/L at a temp. of 20C and a pressure of 1.1 atm. what is its molar mass.

    asked by John on April 12, 2012
  62. Chemistry

    In an experiment, 25.0 mL of a gas with a pressure of 1.00 atm is contained in a balloon at 25.0°C. The balloon is then cooled to 5.0°C, and the pressure is found to be 0.750 atm. What is the volume of the gas under the new conditions?

    asked by Brittany on November 6, 2012
  63. Chemistry

    Ammonia reacts with oxygen at 120 C to form NO and H20 in a sealed 40-L container. When 34 g of ammonia reacts with 96 g of oxygen, what is the partial pressure of the NO? What is the total pressure?

    asked by Erin on May 20, 2012
  64. physic

    a tank contains 26.0 kg of oxygen gas at a gauge pressure of 8.70 atm. if oxygen is replaced by helium, how many kilograms of the latter will be needed to produce a gauge pressure at 7.00 atm?

    asked by yuri on October 12, 2010
  65. Chemistry

    Consider the evaporation of water at 298 K and 1 atm pressure: H20 (l) H20 (g) Given that ΔGOrxn= 8.6kJ/mol, what is the equillibrium vapor pressure of water at 298 K?

    asked by anna on November 10, 2014
  66. Chemistry

    a 265 ml flask contains pure helium at a pressure of 756 torr. A second flask with a volume of 460 ml contains pure argon at a pressure of713 torr

    asked by FSU on February 17, 2011
  67. Chemistry

    A sample of oxygen is collected over water at 22 C and 762 torr. What is the partial pressure of the dry oxygen? The vapor pressure of water at 22C is 19.8 torr

    asked by Sara on July 20, 2013
  68. chem

    All the oxygen gas from a 22.0-L container at a pressure of 72.2 kPa is added to a 18.0-L container of hydrogen at a pressure of 150. kPa. After the transfer, what is the partial pressures of hydrogen?

    asked by Anonymous on November 12, 2014
  69. algebra

    The atmospheric pressure P in pounds per square inch (psi) is given by P = 14.7 e^−0.21 a where a is the altitude above sea level (in miles). If a city has an atmospheric pressure of 12.17 psi, what is its altitude?

    asked by lisa on November 11, 2013
  70. chemistry

    a gas has a volume of 95 mL at a pressure of 930 torr. What volume will the gas occupy if the pressure is increased to 970 torr and the temperature remains constant

    asked by viridiana on December 6, 2015
  71. Chem

    a gas has a volumn of 36.0 L and a pressure of 750 torr when the temperature is 10 degrees celsius. what is the pressure if the volume changes to 78 degrees celsius if the amount of gas stays the same?

    asked by Christy on August 24, 2015
  72. Chemistry

    A sample of oxygen is collected over water at 22 C and 762 torr. What is the partial pressure of the dry oxygen? The vapor pressure of water at 22C is 19.8 torr.

    asked by Sara on July 20, 2013
  73. chemistry

    How many grams of NaCl must be added to 225.0 g of H2O at 45 °C to lower the vapor pressure of water by 2.21 mmHg? The vapor pressure of pure water is 71.93 mmHg at 45 °C.

    asked by Kelly on April 20, 2013
  74. chemistry

    calculate the vapor pressure of a solution 0.53 mol of cholestrol in 4.1 molof toluene at 32 degree C. pure toluene has a vapor pressure of 41 torr at 32 degree C

    asked by courtney on April 28, 2014
  75. math

    The atmospheric pressure P in pounds per square inch (psi) is given by P = 14.7 e^−0.21 a where a is the altitude above sea level (in miles). If a city has an atmospheric pressure of 11.35 psi, what is its altitude?

    asked by Anonymous on November 14, 2013
  76. chemistry

    A volume of 35.0 mL of nitrogen gas was collected over water at 24 degrees C and 99.1kPa. The vapor pressure of water at this temperature is 2.99 kPa. What is the pressure of the nitrogen gas alone?

    asked by Edward on June 14, 2010
  77. Chemistry

    After the volatile liquid has been added to the Erlenmeyer flask, the total pressure in the flask equals the vapor pressure of the volatile liquid. True or False?

    asked by Anonymous on February 6, 2015
  78. science

    how would you make 500.0mL of a 0.200M NaOH solution from a 15.0 M stock NaOH solution?? I assume that you want the volumes rather than the mechanics of carrying it out? a) How many moles do you need in the 500 ml to have 0.200 M? b) What volume of 15.0 M

    asked by Mel on April 5, 2007
  79. Math

    14 boys play basketball, 12 boys play soccer, 16 boys play baseball. How many boys play basketball, soccer, or baseball?

    asked by Heather on October 28, 2014
  80. Maths *have answer, want method* Urgent!

    Suppose that the blood pressure of the human inhabitants of a certain Pacific island is distributed with mean, \mu = 108 mmHg and standard deviation , \sigma = 6 mmHg. According to Chebyshev's Theorem, at least what percentage of the islanders have blood

    asked by Orla on April 13, 2013
  81. chemistry

    Before a trip from New York to Boston, the pressure in an automobile tire is 2.5 atm at 272 K. At the end of the trip, the pressure gauge reads 1.94 atm. What is the new Celsius temperature of the air inside the tire? (Assume tires with constant volume.)

    asked by please help on March 8, 2012
  82. chem help

    a scuba diver breathing normal air descends 100m of depth, where the total pressure is 11 atm. What is the partial pressure of oxygen that the diver experiences at this depth? Can someone help out on this question? Make a ratio: 11atm/1atm= P/partial

    asked by david on March 19, 2007
  83. Chemistry

    4 Questions on molarity that I really don't understand. I have the formulas, but they don't seem to fit in to the question right. Please take a look, thanks! 1. Calculate the weight, in grams, of HNO3 present in 1.0 litre of 0.10M of solution. 2. What is

    asked by Bethany on October 25, 2015
  84. physics

    Ok, so I know I already posted another really long question but we have not learned this yet and are expected to do homework on it. Please help me. An ideal monotonic gas is compressed at a constant pressure of 0.9 atm from 14 L to 3.5 L. Note: Atmospheric

    asked by anonymous on April 11, 2012
  85. Physics

    When working with the properties of Saturated Steam. The pressure table supplied states: Pressure kPa = 1100 (P) Temp in Celsius = 184.09 (T) Specific Volume = Sat. Liquid = 1.1330 (Vf) Specific Volume = Sat.Vapor = 177.53 (Vg) Enthalpy = Saturated Liquid

    asked by Danny on July 21, 2013
  86. Statistics

    An insurance company wishes to examine the relationship between income (in $,000) and the amount of life insurance (in $,000) held by families. The company drew a simple random sample of families and obtained the following results: (Family) (Income)

    asked by Jak on April 22, 2013
  87. Economics

    Consider the production function Q= 20K^(1/2)L^(1/2). The firm operates in the short run with 16 units of capital. a. The firm's short-run production function is Q=? b. The average product of labor function is AP=? c. The marginal product of labor function

    asked by Catherine on October 31, 2011
  88. math

    The radius of a sphere immersed in an infinite ocean of incompressible fluid with density according to the equation, R(t) = A + a cos(nt), where R(t) is a function of time, t, and A, constants, with ‘a’ being positive. The fluid moves radially under no

    asked by paul gokool on October 12, 2011
  89. chemistry

    Which of the following is NOT true about the thermodynamic standard state? A. A pure liquid is in its standard state at 25C and a vapor pressure of 1.00 atm. B. An aqueous solution is in its standard state at a concentration of 1.00 M. C. A gas is in its

    asked by jeff on May 17, 2009
  90. Chemsitry

    Which of the following is NOT true about the thermodynamic standard state? A. A solid is in its standard state when the atmospheric pressure is 1.00 atm and the temperature is 25C. B. An aqueous solution is in its standard state at a concentration of 1.00

    asked by Anonymous on February 25, 2008
  91. chemistry

    Which of the following is NOT true about the thermodynamic standard state? A. A gas is in its standard state when its pressure is 1.00 atm and its temperature is 25C . B. An aqueous solution is in its standard state at a concentration of 1.00 M. C. A solid

    asked by jina on February 20, 2008
  92. physics

    At 20 degrees C an aluminum ring has an inner diameter of 5.000 cm, and a brass rod has a diameter of 5.050 cm. Keeping the brass rod at 20°C, which of the following temperatures of the ring will allow the ring to just slip over the brass rod? (Al = 2.4

    asked by Anonymous on July 31, 2011
  93. AP US History

    "In what ways and to what extent did constitutional and social developmetns between 160 and 1877 amount to a revolution?" That's the DBQ Question I have to answer. Once I get the ideas flowing I'll know how to incorporate the documents. I have an idea for

    asked by AR on September 10, 2009
  94. math

    a locomotive is traveling at 120 mph. the engineers reaction time is 0.9 seconds how many feet will the train travel before the engineer recognises an emergency and applies the brake. A.265.ft B.260.ft C.160.ft D.165.ft.

    asked by jamie on September 27, 2010
  95. chemistry

    In the reaction of N2 and H2 to produce NH3, how many moles of N2 will produce 25.9 moles NH3?

    asked by Anonymous on February 12, 2012
  96. science

    An excess of aluminum metal is added to 200.0 mL of 0.025 M solution of CuCl2, reducing the Cu+2 ions to metallic Cu. If the temperature of the solution increases from 25.0 to 27.5 degrees celsius, what is the enthalpy of this reaction per mole of Cu

    asked by chem on December 29, 2010
  97. Chem, could someone cheak my work please.

    I did this experiment where I filled a graduated cylinder with water. The I put a stopper on it and put it under water and removed the stopper. The with a modified lighter (that wouldn't release sparks) I added butane gas. I got the following results: mass

    asked by Lena on December 12, 2008
  98. algebra

    am I right? 1. Simplify radical expression sqrt 50 5 sqrt ^2*** 2 sqrt ^5 5 sqrt ^10 5 2. Simplify the radical expression sqrt 56x^2 28x 2x sqrt 14*** 2x sqrt 7 sqrt 14x2 3. Simplify the radical expression. sqrt 490y^5w^6 2 sqrt 135y^2 2y sqrt 135*** 27

    asked by Carl Wheezer on May 7, 2017
  99. The Nature of Chemical Reactions

    1. Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of

    asked by Anonymous on October 23, 2011
  100. Chemistry

    Can you please someone check my answer for me? I don't know how to start thses answer. Chemistry is not my things. Please give me answers. :( a)Determine the number of grams in 0.750 moles of the compound Iron(II)phosphate: Fe3(PO4)2. answer: 129.68grams

    asked by Anonymous on April 1, 2010