Question

what is vapor density of a gas

Answer 1

Answer:

vapor density

Weight of a unit volume of gas or vapor compared to (divided by) the weight of an equal volume of air (or, sometimes, hydrogen).

Vapour density of the gas= Density of the gas/Density of hydrogen.

Explanation:

Vapour density is the density of a vapour in relation to that of hydrogen.

In other words, vapour density means how many times of gas is heavier than the density of hydrogen gas at same condition

Vapour density is valid for volatile substance but can be used for all gases

Mathematically,

Vapour density = (density of gas)/density of hydrogen gas

=> Vapour density = (M/Vm)/(2/Vm), here M is molar mass of gas in g, 2 is molar mass of H2 gas and Vm volumes of gases

So, Vapour density = molar mass of gas/2

Vapour density is a unitless quantity

For example Vapour density of CO2 is (12+32)/2 i.e. 22

Answer 2

Vapor density is the weight of a volume of pure vapor or gas compared to an equal volume of dry air at the same temperature and pressure. It is obtained by dividing the molecular weight of the vapor by the average molecular weight of air thus, it is unitless.

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