Ethylene dibromide ($C_2H_4Br_2$) and 1,2-dibromo propane form a series of ideal solutions over the whole range of composition. At $85^{\large\circ}$C, the vapour pressures of these two liquids are 173 and 127 torr respectively. What would be the mole fraction of ethylene dibromide in a solution at 85$^{\large\circ}$C equilibrated with 1 : 1 molar mixture in the vapour?

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