Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 13 Solutions and Their Behavior - Study Questions - Page 505d: 73


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Work Step by Step

By definition: $\Delta H^0_{soln}=\Delta H^0_f(aq)- \Delta H^0_f(s)$ Li2SO4: $\Delta H^0_{soln}=-1464.4-(-1436.4)=-28\ kJ/mol$ -> exothermic K2SO4: $\Delta H^0_{soln}=-1413.0-(-1437.7)=+24.7\ kJ/mol$ -> endothermic From table 13.1: LiCl: $\Delta H^0_{soln}=-445.6-(-408.7)=-36.9\ kJ/mol$-> exothermic KCl: $\Delta H^0_{soln}=-419.5-(-436.7)=+17.2\ kJ/mol$ -> endothermic Both lithium salts have exothermic solubilization, while both potassium salts have endothermic ones.
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