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Heat of solution of a mixture is 10 J, what is the heat dissolution?

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Heat of solution of a mixture is 10 J, what is the heat dissolution?

(a) -10 J

(b) 10 J

(c) 0

(d) Cannot be determined

This question was addressed to me in examination.

This key question is from Heat of Solution, Dissolution and Mixing in portion Energy Balances that Include the Effects of Chemical Reaction, Ideal Processes, Efficiency and the Mechanical Energy Balance and Heats of Solution and Mixing of Basic Chemical Engineering

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Correct choice is (a) -10 J

Easy explanation: Heat of dissolution = – Heat of solution = -10 J.

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