Define the following terms. (i) Relative molecular mass (ii) Vapour density

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Solution

i. Relative molecular mass: It is defined as the ratio of mass of 1 molecule of gas or vapour to the mass of 1 atom of hydrogen.

Relative molecular mass of a gas= $\frac{M a s s o f 1 m o l e c u l e o f a g a s o r v a p o u r}{M a s s o f 1 a t o m o f h y d r o g e n}$

ii. Vapour density (V.D): It is defined as the ratio of mass of a certain volume of gas or vapour to the mass of the same volume of hydrogen at the same temperature and pressure.

V.D.= $\frac{M a s s o f 1 v o l u m e o f a g a s o r v a p o u r}{M a s s o f 1 v o l u m e o f h y d r o g e n}$

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