$\therefore {\text{ }}{{\text{p}}_{\text{A}}}{\text{ = }}{{\text{Y}}_{\text{A}}}{\text{ }} \times {\text{ p}}$ કુલ
$\therefore {\text{ }}{{\text{p}}_{\text{A}}}^{\text{0}}{{\text{X}}_{\text{A}}}{\text{ = }}{{\text{Y}}_{\text{A}}}{\text{ }} \times {\text{ P}}$ કુલ
${Y_A} = \frac{{{p_A}^0{X_A}}}{{{p_A}^0{X_A} + {p_B}^0{X_B}}}$
$ = \frac{{1 \times 1}}{{(1 \times 1) + (2 \times 2)}} = \frac{1}{5}$
$\therefore \,\,{Y_A} = 0.2$
$(K_f =-1.86\,^o\, C/m)$