Chemistry - Liquid Solution Question with Solution | TestHub

V.P. of solution at $t^{\circ }\mathrm{C}=760\mathrm{mm}$ [at b.p., V.P. of solution =atompheric pressure] Thus $={\mathrm{P}}_{\mathrm{A}}^{\circ }{\mathrm{x}}_{\mathrm{A}}+{\mathrm{P}}_{\mathrm{B}}^{\infty }{\mathrm{x}}_{\mathrm{B}}$ or $\mathrm{P}={\mathrm{P}}_{\mathrm{A}}^0\cdot {\mathrm{x}}_{\mathrm{A}}+{\mathrm{P}}_{\mathrm{B}}^0\left(1-{\mathrm{x}}_{\mathrm{A}}\right)\left[\because {\mathrm{x}}_{\mathrm{A}}+{\mathrm{x}}_{\mathrm{B}}=1\right]$ or $760=400{\mathrm{X}}_{\mathrm{A}}+800\left(1-{\mathrm{X}}_{\mathrm{A}}\right)[\because \mathrm{P}=760\mathrm{mmofHg}]$ or $-800+760=-400x_{\mathrm{A}}$ or $-40=-400{\mathrm{x}}_{\mathrm{A}}$ or $x_{\mathrm{A}}=\frac{40}{400}=0.1$ Thus mole fraction in solution is 0.1