Introductory Chemistry (5th Edition)

Published by Pearson
ISBN 10: 032191029X
ISBN 13: 978-0-32191-029-5

Chapter 8 - Quantities in Chemical Reactions - Exercises - Questions: 13

Answer

At constant pressure, the amount of energy released or consumed during a reaction is called the enthalpy of a reaction.

Work Step by Step

It is an important factor as it helps in calculating the amount of thermal energy liberated or consumed in a chemical reaction in the given set of conditions . Change in enthalpy is negative if heat flows out of the system, and it is positive if energy flows into the system. Hence, for exothermic reactions, dH is negative, and dH is positive for endothermic reactions.
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