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What is the heat of dissolution if the heat of reaction is 10 J in the energy balance?

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What is the heat of dissolution if the heat of reaction is 10 J in the energy balance?

(a) -10 J

(b) 10 J

(c) 0

(d) Cannot be determined

The question was asked by my school principal while I was bunking the class.

My question is from Effects of Mixing into Energy Balance in division 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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The correct answer is (a) -10 J

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

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