Chemistry - Liquid Solution Question with Solution | TestHub

Two liquids$\mathrm{A}$$\mathrm{a}\mathrm{n}\mathrm{d}$$\mathrm{B}$form an ideal solution. At$300$$\mathrm{K}$the vapour pressure of a solution of$1$$\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{e}$of$\mathrm{A}$and$\mathrm{x}$moles of$\mathrm{B}$is$550$$\mathrm{m}\mathrm{m}$of Hg. If the vapour pressures of pure$\mathrm{A}$$\mathrm{a}\mathrm{n}\mathrm{d}$$\mathrm{B}$are$400$$\mathrm{m}\mathrm{m}$of Hg nd$600$$\mathrm{m}\mathrm{m}$of Hg respectively, then$\mathrm{x}$is -