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 217b: 43


$-296.8\ kJ/mol$

Work Step by Step

From the definition of heat capacity: $(923\ J/K+815\ g\times 4.184\ J/g.K ) \times(26.72-21.25:)\ K=23.7\ kJ$ Negative value because it's an exothermic process. Number of moles of $S_8$: $2.56\ g\div 256.48\ g/mol=0.00998\ mol$ From stoichiometry: $0.0799\ mol\ SO_2$ Enthalpy of combustion: $-23.7\ kJ/0.0799\ mol=-296.8\ kJ/mol$
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