Gases Review Question Preview (ID: 16101)


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When a sample of oxygen gas in a closed container of constant volume is heated until its absolute temperature is doubled, which of the following is also doubled?
a) The density of the gas
b) The pressure of the gas
c) The average velocity of the gas molecules
d) The number of molecules per cm3

The density of an unknown gas is 4.20 grams per liter at 3.00 atmospheres pressure and 127 °C. What is the molecular weight of this gas? (R = 0.0821 L-atm / mole-K)
a) 14.6
b) 46.0
c) 88.0
d) 94.1

Equal masses of three different ideal gases, X, Y, and Z, are mixed in a sealed rigid container. If the temperature of the system remains constant, which of the following statements about the partial pressure of gas X is correct?
a) It is equal to 1/3 the total pressure
b) It depends on the relative molecular masses of X, Y, and Z.
c) It depends on the intermolecular forces of attraction between molecules of X, Y, and Z.
d) It depends on the average distance traveled between molecular collisions

Two flexible containers for gases are at the same temperature and pressure. One holds 0.50 grams of hydrogen and the other holds 8.0 grams of oxygen. Which of the following statements regarding these gas samples is FALSE?
a) The volume of the hydrogen container is the same as the volume of the oxygen container.
b) The number of molecules in the hydrogen container is the same as the number of molecules in the oxygen container.
c) The density of the hydrogen sample is less than that of the oxygen sample.
d) The average speed of the hydrogen molecules is the same as the average speed of the oxygen molecules.

When the actual gas volume is greater than the volume predicted by the ideal gas law, the explanation lies in the fact that the ideal gas law does NOT include a factor for molecular…
a) volume
b) mass
c) velocity
d) attractions

A compound is heated to produce a gas whose molecular weight is to be determined. The gas is collected by displacing water in a water-filled flask inverted in a trough of water. Which of the following is necessary to calculate the molecular weight of
a) Mass of the compound used in the experiment
b) Vapor pressure of the water
c) Temperature of the water in the trough
d) Volume of water displaced from the flask

A sample of 9.00 grams of aluminum metal is added to an excess of hydrochloric acid. The volume of hydrogen gas produced at standard temperature and pressure is…
a) 22.4L
b) 11.2L
c) 7.46L
d) 5.60L

A gaseous mixture containing 7.0 moles of nitrogen, 2.5 moles of oxygen, and 0.50 mole of helium exerts a total pressure of 0.90 atmospheres. What is the partial pressure of the nitrogen?
a) 0.13 atm
b) 0.27atm
c) 0.63atm
d) 0.90atm

A sample of 0.010 moles of oxygen gas is confined at 127 °C and 0.80 atmospheres. What would be the pressure of this sample at 27 °C and the same volume?
a) 0.10 atm
b) 0.20 atm
c) 0.60 atm
d) 0.80 atm

Hydrogen gas is collected over water at 24 °C. The total pressure of the sample is 755 millimeters of mercury. At 24 °C, the vapor pressure of water is 22 millimeters of mercury. What is the partial pressure of the hydrogen gas?
a) 22 mm Hg
b) 733 mm Hg
c) 755 mm Hg
d) 760 mm Hg

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