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Depression in Freezing Point

34.Calculate ...

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34.Calculate heat of hydration of mgso4 if heat of dissolution of anhydrous mgs04 is -179 kj/mil and heat of dissolution of mgs04.7 H2O is 80 kj.

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25^{\circ} C

1

M g S O_{4}

was dissolved in water, the heat evolved was found to be

91.2 kJ

M g S O_{4} .7 H_{2} O

on dissolution gives a solution of the same composition accompanied by an absorption of

13.8 kJ

. The enthalpy of hydration, i.e.,

Δ H

for the reaction

M g S O_{4} (s) + 7 H_{2} O (l) \to M g S O_{4} .7 H_{2} O (s)

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