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At a certain temperature pure liquid A a...

At a certain temperature pure liquid `A` and liquid `B` have vapour pressure `10` and `37` torr respectively. For a certain ideal solution of `A` and `B`, the vapours in equilibrium with the liquid has the components `A` and `B` in the partial pressure ratio `P_(A):P_(B) = 1:7`. The mole fraction of `A` in the solution are:

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