CHM1045
Fall 1999
Dr. Michael Blaber

Name_______________________________

SS#________________________________

Exam #4 100 points total

Wednesday December 15 1999

  1. Name three characteristics of liquids that distinguish them from gases (6 points)

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  2. A submarine at the bottom of the ocean experiences a pressure of 3.44 x 107 N/m2 due to the water above. Assuming that 1 m3 of seawater has a mass of 1x103 kg, and gravitational force is 9.78 m/s2, how deep is the submarine? (10 points)

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  3. What is the pressure, in atmospheres, of the gas in the following open-tube manometer? Assume that atmospheric pressure is 99.3 kPa. (5 points)

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  4. A 4.56 liter sample of gas at 60° C and 0.893 atm of pressure is subsequently compressed to 0.127 liters. In response to being compressed, the temperature increases to 156° C. What is the pressure of the gas after this compression? (5 points)

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  5. A weather balloon holds 423 L of gas at standard temperature and pressure. How many moles of gas are in the balloon? (5 points)

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  6. What is the volume of a 0.523 mol sample of gas at 18.6 atm pressure at 15° C? (5 points)

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  7. What is the density of Nitrous oxide (N2O) gas at 1.53 atm and 102°C? (5 points)

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  8. An artificial atmosphere for the planet Mars consists of 80% carbon dioxide (CO2), 15% methane (CH4), and 5% Nitrogen (N2). 10g of this gas mixture is placed in a 100L container at 4°C. What is the partial pressure of each gas? (6 points) What is the mole fraction of each compound in the artificial atmosphere? (6 points)

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  9. A space ship contains a hydrogen tank with a volume of 5.2 x 106 L. How many grams of hydrogen will the tank hold if it can be pressurized to 1000 kPa at 22°C? (5 points). If the space ship burned all this hydrogen in the presence of oxygen, how many grams of water would be produced? (5 points)

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  10. A box contains 4 molecules of diatomic oxygen. Their individual velocities are 4.7, 3.8, 14.9 and 9.6 m/s. What is the average kinetic energy (in Joules) of these gaseous molecules? (5 points)

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  11. What is the rate of diffusion for a molecule of water compared to a molecule of carbon dioxide? (5 points)

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  12. Van der Waals constants for diatomic hydrogen are a = 0.244 L2 atm/mol2 and b= 0.0266 L/mol. Calculate the pressure exerted by 30.2 g of hydrogen gas at 12° C in a container with a volume of 1.2 L (5 points)

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  13. What is the enthalpy change associated with the heating of 117g of H2O from 235K to 385K? (10 points)

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  14. Identify the changes in processes indicated in the following phase diagram (6 points)

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  15. Name and describe the four types of intermolecular forces (5 points) What type of intermolecular force probably contributes most to the freezing of water? (1 Point)

 

 

 

 

 

 

 

 

 

 

 

 

 

Useful tables and Constants

Acceleration due to Earth Gravity: 9.78 m/s2

1 Pa = 1 N/m2

1 N = 1 kg m/s2

1 atm = 760 torr = 101 kPa = 760 mm Hg

Specific Heats:

Ice: 2.09 J/g K

Water: 4.18 J/g K

Steam: 1.84 J/g K

Heat of fusion of Water: 6.01 kJ/mol

Heat of vaporization of Water: 40.67 kJ/mol