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  4. Which of the following gases will have least volume if 10 g of each gas is taken at same temperature and pressure?

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Q. Which of the following gases will have least volume if $10\, g$ of each gas is taken at same temperature and pressure?

Some Basic Concepts of Chemistry

Solution:

Number of moles $\propto \frac{1}{\text{Molecular mass}}$
Molecular mass of $CO_2 = 44, N_2= 28, CH_4= 16$,
$HCl=36.5$
$CO_2$ will have least volume, as no. of moles is directly proportional to volume at constant $P$ and $T$.