JAMB Chemistry
The vapour density of a gas may be defined as
a.
The mass of a unit volume of the gas compared to equal volume of water vapour
b.
The mass of a unit volume of the gas compared to equal volume of hydrogen
c.
The mass of a unit volume of the gas compared to equal volume of oxygen
d.
The mass of a unit volume of the gas minus the vapour pressure of water
Correct answer: B
The vapor density of a gas is the mass of a unit volume of the gas compared to the mass of a unit volume of hydrogen gas at the same temperature and pressure. It can also be expressed as the ratio of the density of a gas to the density of hydrogen at the same temperature and pressure.