Gas Laws Practice Questions II with Answers

Gas Laws Practice Questions II with Answers
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  1. It is found that 250. mL of a gas at STP has a mass of 0.700 g. What is the molar mass?
    • A) 62.7 g/mol
    • B) 2.80 g/mol
    • C) 15.9 g/mol
    • D) 11.2 g/mol
    • E) 128 g/mol
  1. What volume does 40.5 g of N2 occupy at STP?
    • A) 64.8 L
    • B) 1.81 L
    • C) 32.4 L
    • D) 50.7 L
    • E) none of the above
  1. Body temperature is about 309 K. On a cold day, what volume of air at 276 K must a person with a lung capacity of 2.2 L breathe in to fill the lungs?
    • A) 2.46 L
    • B) 1.97 L
    • C) 2.08 L
    • D) 3.93 L
    • E) none of the above
  1. Air has an average molar mass of 29.0 g/mol. The density of air at 0.97 atm and 30.0°C is:
    • A) 29.0 g/L
    • B) 39.0 g/mL
    • C) 1.13 g/L
    • D) 1.35 g/mL
    • E) 11.4 g/L
  1. If a 17.90-g sample of a gas occupies 10.0 L at STP, what is the molar mass of the gas at 125°C?
    • A) 5.48 g/mol
    • B) 40.1 g/mol
    • C) 18.4 g/mol
    • D) 58.5 g/mol
    • E) Not enough information is given.
  1. What volume of measured at STP is produced by the combustion of 6.27 g of natural gas according to the following equation?
    • A) 8.76 L
    • B) 17.5 L
    • C) 4.38 L
    • D) 19.1 L
    • E) 3.14 L
  1. A chemical reaction produced 10.1 cm3 of nitrogen gas at 23 °C and 746 mmHg. What is the volume of this gas if the temperature and pressure are changed to 0 °C and 760 mmHg?
    • A) 9.14 cm3
    • B) 9.49 cm3
    • C) 10.8 cm3
    • D) 11.2 cm3
    • E) 10.1 cm3
  1. A sample of gas occupies 20.0 liters at 32 °C when the pressure is 0.750 atm. What temperature in °C is required to increase the volume to 25.0 liters at a pressure of 0.680 atm?
    • A) -3.90 °C
    • B) 309 °C
    • C) 72.7 °C
    • D) 346 °C
    • E) 36.1 °C
  1. Which of the following is not being considered as an energy source for the future?
    • A) ethanol
    • B) methanol
    • C) seed oil
    • D) shale oil
    • E) carbon dioxide
  1. One of the main advantages of hydrogen as a fuel is that:
    • A) The only product of hydrogen combustion is water.
    • B) It exists as a free gas.
    • C) It can be economically supplied by the world’s oceans.
    • D) Plants can economically produce the hydrogen needed.
    • E) It contains a large amount of energy per unit volume of hydrogen gas.
  1. Which of the following is both a greenhouse gas and a fuel?
    • A) carbon dioxide
    • B) coal
    • C) freon
    • D) methane
    • E) nitrogen
  1. All of the following statements about the greenhouse effect are true except:
    • A) It occurs only on earth.
    • B) The molecules H2O and CO2 play an important role in retaining the atmosphere’s heat.
    • C) Low humidity allows efficient radiation of heat back into space.
    • D) The carbon dioxide content of the atmosphere is quite stable.
    • E) A and D
  1. This fossil fuel was formed from the remains of plants that were buried and exposed to high pressure and heat over time.
    • A) coal
    • B) natural gas
    • C) diesel fuel
    • D) propane
    • E) Gasoline
  1. Consider a sample of gas in a container on a comfortable spring day. The Celsius temperature suddenly doubles, and you transfer the gas to a container with twice the volume of the first container. If the original pressure was 12 atm, what is a good estimate for the new pressure?
    • A) 3 atm
    • B) 5.5 atm
    • C) 6.4 atm
    • D) 12 atm
    • E) 15 atm
  1. Which of the following is the best qualitative graph of P versus molar mass of a 1-g sample of different gases at constant volume and temperature?
    • A)
    • B)
    • C)
    • D)
    • E) none of the above
  1. A 140.0-g sample of water at 25.0°C is mixed with 111.7 g of a certain metal at 100.0°C. After thermal equilibrium is established, the (final) temperature of the mixture is 29.6°C. What is the specific heat capacity of the metal, assuming it is constant over the temperature range concerned?
    • A) 0.34 J/g°C
    • B) 0.68 J/g°C
    • C) 0.22 J/g°C
    • D) 2.9 J/g°C
    • E) none of the above
  1. When 0.72 g of a liquid is vaporized at 110°C and 0.967 atm, the gas occupies a volume of 0.559 L. The empirical formula of the gas is CH2. What is the molecular formula of the gas?
    • A) CH2
    • B) C2H4
    • C) C3H6
    • D) C4H8
    • E) none of the above