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 217c: 46


$-2812 \ kJ/mol$

Work Step by Step

From the definition of heat capacity: $(575\ g\times 4.184\ J/g.K+650\ J/g)\times (25.23-21.70)\ K=10.8\ kJ$ Since it's an exothermic process, the sign is negative. Number of moles of glucose: $0.692\ g\div 180.16\ g/mol=0.00384\ mol$ Hence: $\Delta U=-10.8\ kJ/0.00384\ mol=-2812 \ kJ/mol$
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