b
\({\text{P}}\) કુલ \({\text{  =  }}{{\text{p}}_{\text{A}}}^{\text{0}}{{\text{X}}_{\text{A}}}{\text{  +  }}{{\text{p}}_{\text{B}}}^{\text{0}}{{\text{X}}_{\text{B}}}\)

\({\text{P}}\) કુલ \({\text{ = }}\left( {{p_A}^0 \times \frac{1}{2}} \right) + \left( {{p_B}^0 \times \frac{1}{2}} \right)\) \((\because \,\,1:1\) મોલ)

\(\therefore 400 = \frac{{{P_A}^0}}{2} + \frac{{{P_B}^0}}{2}\)

\(\therefore \,\,\,\,{p_A}^0 + {p_B}^0 = 800\) ........... \((1)\)

\({\text{P}}\) કુલ \({\text{ =  }}{{\text{p}}_{\text{A}}}^{\text{0}}{{\text{X}}_{\text{A}}}{\text{  +  }}{{\text{p}}_{\text{B}}}^{\text{0}}{{\text{X}}_{\text{B}}}\,\,\,\)

\(\,\therefore \,\,\,350 = \left( {{p_A}^0 \times \frac{1}{3}} \right) + \left( {{p_B}^0 \times \frac{2}{3}} \right)\) (\(\because \,\,1:2\) મોલ)

\(\therefore 350 = \frac{{{p_A}^0}}{3} + \frac{{2{p_B}^0}}{3}\,\)

\(\,\therefore \,\,\,\,{p_A}^0 + 2{p_B}^0 = 1050\) ........... \((2)\)

પરિણામ \((1)\)  અને \((2)\)  પરથી,\({\text{P}}{{\text{A}}^{\text{0}}}{\text{  =  550}}\) મિમી, \({{\text{p}}_{\text{B}}}^{\text{0}}{\text{  =  250}}\) મિમી