What is the heat of reaction if enthalpy of inputs and outputs at 25oC are 10 J and 20 J, the enthalpy of input and outputs at given temperature are 25 J and 30 J, enthalpy change of the reaction is 50 J?

Correct Answer: 55 J
Heat of reaction = (25 – 10) – (30 – 20) + 50 = 55 J.