Question

question 12 (5 points)
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when a reaction takes place at constant pressure, the heat transferred is equal to the
a) mass of reaction.
b) entropy of reaction.
c) enthalpy of reaction.
d) energy of reaction.

Explanation:

To solve this, we recall the definitions of the terms:

• Option A: Mass of reaction is about the amount of substance, not heat transfer.
• Option B: Entropy is a measure of disorder, not directly heat transfer at constant pressure.
• Option C: Enthalpy change ($\Delta H$) is defined as the heat transferred in a reaction at constant pressure.
• Option D: Energy of reaction is a broader term, but at constant pressure, the specific term for heat transfer is enthalpy.

Answer:

C) enthalpy of reaction.