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: 97


$-36.03\ kJ/mol$

Work Step by Step

From the definition of heat capacity: $(415\ g\times 4.184\ J/g.K+155\ J/K)\times(20.72-18.90)\ K=3442.3\ J$ With a negative sign since the temperature raises. Number of moles of ammonium nitrate: $7.647\ g\div80.04\ g/mol=0.096\ mol$ Hence: $-3442.3\ J\div 0.096\ mol=-36.03\ kJ/mol$
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