Gas Practice

The molar volume of a gas at STP occupies _____________.

• 22.4 L

• 0˚C

• 1 kiloPascal

• 12 grams

If 2.00 L of a gas in a container at room temperature exerts a pressure of 4.00 atm. If the pressure doubles and the temperature remains the same, the volume would become ________.

• 16.0 L

• 2.00 L

• 4.00 L

• 1.00 L

Decreasing the pressure on a liquid will likely allow it to become which phase of matter? 

• Solid

• Liquid

• Gas

• Plasma

If the atmospheric pressure suddenly becomes less than the pressure inside a small balloon, which of the following would you expect to occur?

• The balloon will increase in size.

• The balloon will decrease in size.

• The balloon will remain unchanged.

• The balloon will twist itself into a balloon animal.

Which phase of matter has the strongest forces of attraction between particles?

• solid

• liquid

• gas

• plasma

A sample of a gas (5.0 mol) at 1.0 atm is expanded at constant temperature from 10.0 L to 15.0 L. The final pressure is ___ atm.

• 1.5 atm

• 15 atm

• 0.67 atm

• 3.3 atm

• 7.5 atm

A sample of He gas (2.35 mol) occupies 57.9 L at 300.0 K and 1.00 atm. The volume of this sample is ___L at 423 K and 1.00 atm.

• 0.709 L

• 57.9 L

• 41.1 L

• 81.6 L

• 1.41 L

Gases generally have

• low density

• high density

• closely packed particles

• no increase in volume when temperature is increased

• no decrease in volume when pressure is increased

Pressure is

• defined as the mass that an object exerts when at rest

• measured in Newtons

• defined as the number of moles of substance divided by the mass of the substance

• defined as the force per unit area

• measured in grams

A gas sample is held at constant pressure. The gas occupies 3.62 L of volume when the temperature is 21.6°C. Determine the temperature at which the volume of the gas is 3.42 L.

• 312K

• 278K

• 20.4K

• 295K

• 552K