Q.

The molecular mass of a gas is –

A. twice its vapour pressure
B. equal to its vapour pressure
C. half its vapour pressure
D. not related to its vapour pressure
Answer» A. twice its vapour pressure
Explanation: The molecular weight (molar mass) of any gas is the mass of one particle of that gas multiplied by Avogadro's number. It is twice its vapor pressure since the molecular mass of any gas is twice its density in relation to hydrogen which has 2 atoms in one molecule.
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