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What is the heat of reaction if enthalpy of inputs and outputs at 25^oC are 10 J and 8 J, the enthalpy of input and outputs at given temperature are 5 J and 20 J, enthalpy change of the reaction is 30 J?

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What is the heat of reaction if enthalpy of inputs and outputs at 25^oC are 10 J and 8 J, the enthalpy of input and outputs at given temperature are 5 J and 20 J, enthalpy change of the reaction is 30 J?

(a) 13 J

(b) 22 J

(c) 28 J

(d) 35 J

The question was posed to me in an internship interview.

The query is from Energy Balances Application in Processes 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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The correct choice is (a) 13 J

The best I can explain: Heat of reaction = (5 – 10) – (20 – 8) + 30 = 13 J.

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