A.
the mass of a unit volume of the gas compared to an equal volume of water vapour
B.
the mass of a unit volume of the gas compared to an equal volume of hydrogen
C.
the mass of a unit volume of the gas compared to an equal volume of oxygen
D.
the mass of a unit volume of the gas minus the vapour pressure of water
E.
two times the relative molecular mass of the gas
Correct Answer: Option B
Explanation
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