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: 98


$-136.3\ kJ/mol$

Work Step by Step

From the definition of heat capacity: $(650\ g\times 4.184\ J/g.K+550\ J/K)\times(22.3-18.5)\ K=12.4\ kJ$ With a negative sign since the temperature raises. Number of moles of ethanol: $4.20\ g\div 46.07\ g/mol=0.091\ mol$ Hence: $-12.4\ kJ\div 0.096\ mol=-136.3\ kJ/mol$
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