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: 42

Answer

$-95.55\ kJ/mol$

Work Step by Step

From the definition of heat capacity: $140.2\ g\times 4.2\ J/g.K \times(28.8-20.2)\ K)=5064.0\ J$ Negative value because it's an exothermic process. Number of moles of $H_2SO_4$: $5.2\ g\div 98.07\ g/mol=0.053\ mol$ Enthalpy of dissolution: $-5.064\ kJ/0.053\ mol=-95.55\ kJ/mol$
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