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Two balloons are filled one with pure he gas and other with air respectively. If the pressure and temperature of these balloons are same, then the number of molecules per unit volume is
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same in both balloons
Assuming the balloons have the same volume, as $\mathrm{pV}=\mathrm{nRT}$. If $\mathrm{P}, \mathrm{V}$ and $\mathrm{T}$ are the same, $\mathrm{n}$ the number of moles present will be the same, whether it is He or air. Hence, number of molecules per unit volume will be same in both the balloons.
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