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 217g: 91

Answer

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Work Step by Step

Enthalpies of formation (kJ/mol): $C_2H_5OH(l):-277.0, CO_2(g): -393.509, H_2O(g): -241.83$ Enthalpy of combustion: $2\times-393.509+3\times-241.83--277.0=-1235.5\ kJ/mol$ In 100g: $100\ g\div 46.07\ g/mol\times-1235.5\ kJ/mol=-2682\ kJ$
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