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At a constant temperature liquid 'A' has...

At a constant temperature liquid 'A' has vapour pressure of 170 mm Hg and liquid 'B' has vapour pressure of 280 mm Hg. A solution of the two at the same temperature in which mole fraction of A is 0.7 has a total vapour pressure of 376 mm. Identify whether the solution process is Endothermic or Exothermic ?

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