Understanding Gas Density and the Ideal Gas Law

What is the relationship between the density of a gas and its molar mass?

• Density is directly proportional to molar mass.

• Density is unrelated to molar mass.

• Density is inversely proportional to molar mass.

• Density is equal to molar mass.

How is the density of hydrogen gas at STP calculated?

• By subtracting the molar volume from the molar mass.

• By adding the molar mass and molar volume.

• By multiplying the molar mass by the molar volume.

• By dividing the molar mass by the molar volume.

What is the molar volume of an ideal gas at STP?

• 18.0 L per mole

• 24.0 L per mole

• 20.0 L per mole

• 22.4 L per mole

Why is oxygen gas denser than hydrogen gas?

• Because it is a heavier element.

• Because it has a higher molar mass.

• Because it has a lower molar mass.

• Because it has a smaller molar volume.

What conclusion can be drawn from the comparison of hydrogen and oxygen gas densities?

• Gases with lower molar masses are less dense.

• Gases with higher molar masses are less dense.

• Gases with higher molar masses are more dense.

• Gases with lower molar masses are more dense.

Why do hydrogen and helium gases float in air?

• Because they have high densities.

• Because they have low densities.

• Because they are heavier than air.

• Because they are denser than air.

What is the take-home lesson about gas density and molar mass?

• Density is unrelated to molar mass.

• Density is equal to molar mass.

• Density is directly proportional to molar mass.

• Density is inversely proportional to molar mass.

How can the ideal gas law be rearranged to calculate density?

• By subtracting VRT from both sides.

• By adding VRT to both sides.

• By multiplying both sides by VRT.

• By dividing both sides by VRT.

What is the formula for density derived from the ideal gas law?

• D = M/RT

• D = MP/RT

• D = RT/MP

• D = RT/M

What advantage does the ideal gas law provide in calculating gas density?

• It is only applicable to oxygen gas.

• It is only applicable to hydrogen gas.

• It only works at STP.

• It allows calculation at any temperature and pressure.