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: 37


$-56.07\ kJ/mol$

Work Step by Step

From the definition of heat capacity: $(100.0+50.0)\ mL\times 1.00\ g/mL\times 4.2\ J/g.K\times (24.28-22.50)\ K=1121.4\ J$ Exothermic reaction since the temperature increases. Number of moles of CsOH: $0.200\ M\times 100\ mL=20\ mmol$ Number of moles of HCl: $0.400\ M\times 50\ mL=20\ mmol$ Both reactants are in stoichiometric proportions. Enthalpy per mole: $-1121.4\ J\div 20\ mmol=-56.07\ kJ/mol$
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