1. An aquarium with dimensions 0.5m on each side (i.e. a cube with each side 0.5m long) is filled with water. What is the pressure, in Pa, that this aquarium exerts on the top of a table? (8 points)

2. Calculate the pressure, in KPa, of the gas sample in the following open-tube mercury manometer. Assume atmospheric pressure is 745 torr. (6 points)

3. What volume would a 25.3g sample of carbon dioxide occupy under conditions of standard temperature and pressure? (8 points)

4. A weather balloon is released from the ground and floats up into the atmosphere. When it was released it had a volume of 500L, the temperature was 27.5°C and the atmospheric pressure was noted to be 771 torr. At 50,000 feet altitude the temperature is recorded at -61°C and the presssure is 27.5 torr. What is the volume of the balloon at this altitude? (8 points)

5. A certain gas occupies 2.35L at 37°C and 2.09 atm pressure. The sample of gas in question has a mass of 12.3g. What is the molar mass of the gas? (6 points)

6. What volume of carbon dioxide is produced if 57g of propanol (C₃H₇OH) is combusted to completion at 60°C and 1.15 atm pressure (be sure to provide balanced equation)? (10 points)

7. A sample of gas contains the following: O₂ = 27.5%, N₂ = 68.2%, Ar = 4.3% by mass. The pressure of the gas sample is 2.82 atm. What are the partial pressures of the compounds in this gas sample? (10 points)

8. What is the density of ammonia (NH₃) vapor at 0.55 atm and 50°C (8 points)

9. What is the kinetic energy (in Joules) of a 15g bullet with a velocity of 1000 feet per minute, compared to a 120g bullet with a velocity of 3000 feet per minute? (8 points)

10. Given the following equation, calculate the enthalpy change associated with the combustion of 150g of octane. (8 points)

2C₈H₁₈(l) + 25O₂(g) ® 16CO₂(g) + 18H₂O(l) DH = -10.9 kJ

11. A building has a 1,500 pound roof that is made of aluminum. On a hot day in the summer the temperature of the roof in the morning is observed to be 25°C. In the afternoon, the temperature is observed to be 65°C. How many Joules of energy has the roof absorbed from the sun? (8 points)

12. Given the following standard enthalpies of formation, calculate DH_rxn for the combustion of 235g of propane (C₃H₈) under conditions of STP (be sure to provide balanced equation(s)) (12 points)

H₂O(l) DH⁰_f = -286 kJ/mol

CO₂(g) DH⁰_f = -394 kJ/mol

C₃H₈(g) DH⁰_f = -104 kJ/mol

Acceleration due to gravity:

9.81m/s²

Gas Constant:

0.0821 L atm mol^-1 K^-1

8.31 J mol^-1 K^-1

62.4 L torr mol^-1 K^-1

Force:

1N = 1 kg m s^-2

F = mass * acceleration

Energy:

1J = 1N m = 1 kg m² s^-2

Length:

1 m = 39.4 inches

1 mile = 5,280 feet

Mass:

1 kg = 2.2 lb

Pressure:

P = force / area

1Pa = 1N/m²

1Pa = 1Kg/m s²

1atm = 760 torr

1atm = 101 Kpa

760mm Hg = 760 torr

Density:

r = mass / volume

density of H₂O = 1g/ml

Specific Heats:

H₂O = 4.18 J/g °C

Al = 0.9 J/g °C