\(P = 2.5 \times  10^5 \,N\, m^{-2} ,\, V= 20\, L = 20 \times  10^{-3} m^3 , \mu =\) મોલસંખ્યા

\(R = 8.31\, J\, mol^{-1} K^{-1}, \,T = 27 °C = 27 + 273 = 300 K\)

આદર્શ વાયુ અવસ્થા સમીકરણ મુજબ \(PV\, = \,\mu RT\,\,\)

\(\therefore \,\,\mu \, = \,\frac{{PV}}{{RT}}\,\,\,\,\therefore \,\frac{{{m_{{O_2}}}}}{{{M_{{O_2}}}}} = \mu  = \frac{{PV}}{{RT}}\,\,\,\,\,\therefore \,\,\,{m_{{O_2}}}\, = \,\) ઑક્સીજન નું દળ

\({M_{{O_2}}} \times \frac{{PV}}{{RT}}\,\, = \,\frac{{32 \times {{10}^{ - 3}} \times 2.5 \times {{10}^5} \times 20 \times {{10}^{ - 3}}}}{{8.31 \times 300}}\,\,\, = 0.064\,kg\,\,\, = 64 \times {10^{ - 3}}\,kg\,\,\,\, = 64\,\,g\)