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  4. The number of molecules per unit volume (n) of a gas is given by

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Q. The number of molecules per unit volume (n) of a gas is given by

Kinetic Theory

Solution:

$P \forall=n R T$
$n=\frac{P}{R T}$
$\Rightarrow $ no of molecule $=n \cdot N_{A}$
$=\frac{P}{R T} \cdot N_{A}$
$\frac{P}{R /{N _A}}$
$\Rightarrow \frac{p}{KT} $= no.of mol