One mole of a gas is filled in a containers of equal volume container at NTP. The number of molecules in 1 cm³ of volume will be : 

6.02 x 10²³/22400

Number of moles in the first vessel : \(mu_1 = \frac{P_1V}{RT_1}\)

Number of moles in the second vessel : \(mu_2 = \frac{P_2V}{RT_2}\)

[As 22.4 litre = 22.4 x 10³ cm³]

$\Rightarrow \text{ Number of Molecules in }1cm^3\text{ volume of gas is } = \frac{6.02\times 10^{23}}{22400}$