the vapour density of a gas may be defined as

Question 1 Report

the mass of a unit volume of the gas compared to an equal volume of water vapour

the mass of a unit volume of the gas compared to an equal volume of hydrogen

the mass of a unit volume of the gas compared to an equal volume of oxygen

the mass of a unit volume of the gas minus the vapour pressure of water

two times the relative molecular mass of the gas

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