11.  One mole of an anhydrous salt AB dissolves in water with the evolution of 21.0 J mol-1 of heat.  If the heat of hydration of AB is -29.4 J mol-1 , then the heat of dissociation of hydrated salt AB is
a )     50 . 4   J m o l - 1                 b )     8 . 4   J m o l - 1               c )     - 50 . 4   J m o l - 1                 d )     - 8 . 4   J m o l - 1

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