One mole of soda ash dissolves in water with evolution of 25 kJ of heat. Dissolution of 1 mol of the hydrate crystals in water resulted in the absorption of 67 kJ of heat. The heat of hydration of sod

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One mole of soda ash dissolves in water with evolution of 25 kJ of heat. Dissolution of 1 mol of the hydrate crystals in water resulted in the absorption of 67 kJ of heat. The heat of hydration of soda ash is

TestHub · Accepted Answer

Heat of hydration ( Δ H h y d ​ ): Δ H h y d r a t i o n ​ = Δ H d i sso l u t i o n ( h y d r a t e d ) ​ − Δ H d i sso l u t i o n ( anh y d ro u s ) ​ Δ H h y d r a t i o n ​ = 67 − ( − 25 ) = 67 + 25 = + 92 k J

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JEE Advanced (2028)