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The degree of dissociation of Ca(NO3)2 in dilute aqueous solution containing 7.0 g of salt per 100.0 g of water at 100C is 70%.

The degree of dissociation of Ca(NO3)2 in dilute aqueous solution containing 7.0 g of salt per 100.0 g of water at 100C is 70%. If the vapour pressure of water at 100C is 760 mm Hg, the vapour pressure of the solution is

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