Which of hte following contains maximum number of molecules:
(a) 4 g of $O_{2}$ (b) 4 g of $N H_{3}$
(c) 4 g of $C O_{2}$ (d) 4 g of $S O_{2}$

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Solution

Moles is directly proportional to the number of molecules whereas moles is inversely proportional to the relative molecular mass of the molecule.
$N o. space o f space m o l e s equals fraction numerator G i v e n space m a s s over denominator M o l a r space m a s s end fraction$
Since mass is constant for all gases, gas with least Molar mass will have most number of molecules.
Molar mass of - 32 g
- 17g
- 44g
- 64g
Hence NH3 will have most number of molecules.

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