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: 41


$+23.06\ kJ/mol$

Work Step by Step

From the definition of heat capacity: $155.5\ g\times 4.2\ J/g.K \times(18.6-16.2)\ K)=1567.4\ J$ Positive value because it's an endothermic process. Number of moles of $NH_4NO_3$: $5.44\ g\div 80.04\ g/mol=0.0680\ mol$ Enthalpy of dissolution: $+1.567\ kJ/0.0680\ mol=+23.06\ kJ/mol$
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