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What is the heat of reaction if enthalpy of inputs and outputs at 25^oC are 5 J and 8 J, the enthalpy of input and outputs at given temperature are 12 J and 15 J, enthalpy change of the reaction is 25 J?

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What is the heat of reaction if enthalpy of inputs and outputs at 25^oC are 5 J and 8 J, the enthalpy of input and outputs at given temperature are 12 J and 15 J, enthalpy change of the reaction is 25 J?

(a) 20 J

(b) 25 J

(c) 30 J

(d) 35 J

I got this question in semester exam.

My question comes from Energy Balances Application in Processes topic in chapter 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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Right choice is (b) 25 J

Explanation: Heat of reaction = (12 – 5) – (15 – 8) + 25 = 25 J.

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