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: 44


$-394.0\ kJ/mol$

Work Step by Step

From the definition of heat capacity: $(893\ J/K+775\ g\times 4.184\ J/g.K ) \times(27.38-25.00)\ K=9.84\ kJ$ Negative value because it's an exothermic process. Number of moles of $C$: $0.300\ g\div 12.011\ g/mol=0.0250\ mol$ Enthalpy of combustion: $-9.84\ kJ/0.0250\ mol=-394.0\ kJ/mol$
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