Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 5 Principles of Chemical Reactivity: Energy and Chemical Reactions - Study Questions - Page 217f: 89


$-305.3\ kJ/mol$

Work Step by Step

Enthalpies of formation (kJ/mol): $CO_2(g): -393.509, H_2O(l): -285.83, CHCl_3(g): -103.1$ Methane combustion: $-890.4=-393.509+2\times-285.83-\Delta_f H_{CH_4}$ $\Delta_f H_{CH_4}=-74.7\ kJ/mol$ HCl decomposition: $184.6=-2\times\Delta_f H_{HCl}$ $\Delta_f H_{HCl}=-92.3\ kJ/mol$ Main reaction: $-103.1+3\times-92.3- -74.7=-305.3\ kJ/mol$
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