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: 90

Answer

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Work Step by Step

Enthalpies of formation (kJ/mol): $CO(g):-110.525, CO_2(g): -393.509, H_2O(g): -241.83$ Enthalpy of combustion: $-393.509\ kJ/mol$ Enthalpy of water gas reaction: $-110.525--241.83=+131.31\ kJ/mol$ Number of moles of carbon: $1000\ g\div 12.011\ g/mol=83.25\ mol$ Heat required: $83.25\ mol\times 131.31\ kJ/mol=10.93\ MJ$ Mass of carbon for combustion: $10932\ kJ\div(393.509\ kJ/mol\div12.011\ g/mol)=333.7\ g= 0.33\ kg$
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