Chemistry - Mole Concept Question with Solution | TestHub

One mole of any ideal gas occupies $22.7\mathrm{L}$ at standard temperature and pressure.

The number of moles $=\frac{\mathrm{Given} \mathrm{volume}}{\mathrm{Volume} \mathrm{at} \mathrm{STP}}$

Moles $=\frac{2.8375}{22.7}=0.125$

The number of molecules $=\mathrm{moles}\times {\mathrm{N}}_{\mathrm{A}}$

Molecules $=0.125\times 6.022\times {10}^{23}$

$=7.527\times {10}^{22}$