Answer
Please see the work below.
Work Step by Step
We know that the chemical reaction $C(g)+4H(g)\rightarrow CH_4(g)$ is not sufficient for the calculation of $\Delta H f^{\circ}$ of methane as the most stable form of each element is not used.
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 6 - Thermochemistry - Questions and Problems - Page 258: 6.21
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