The vapour pressure of a solution containing 2 g of an electrolyte BA in 100 g water

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Problem

The vapour pressure of a solution containing 2 g of an electrolyte BA in 100 g water, which dissociates in one

B^+

and one

A^-

ion in water, is 751 mm, at

100^{\circ}\text{C}

. Calculate degree of ionisation of BA if its molar mass is 56.