Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 9 - Chemical Bonding I - Questions & Problems: 9.67

Answer

Please see the work below.

Work Step by Step

We know that bond enthalpy is the energy required to break the bond of 1 mole of two atoms in gaseous state. For diatomic molecules the bond enthalpies can be easily determined as they are measured directly. In polyatomic molecules, we have different results from different reactions hence the average enthalpy is considered for these molecules.
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