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Q.

Heat of solution of anhydrous magnesium sulphate is 85.0 KJ/mol. The amount of heat
evolved by dissolving 30 gm of anhydrous magnesium sulphate is

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a

+ 21.5

b

21.5

c

- 4

d

-  21.5

answer is B.

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Detailed Solution

120g of MgSO4 produces →85×103J/mole

30gMgSO4→?=30×85×103120=−21.5J/mole

(Heat of hydration is always negative).

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