Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 13 - The Chemistry of Solutes and Solutions - Questions for Review and Thought - Topical Questions - Page 605b: 25



Work Step by Step

Recall that $\Delta_{r}H_{solution}=-lattice\, energy+ \Delta_{r}H(cation\, hydration) +\Delta_{r}H(anion\, hydration)$ $\implies -63.3\,kJ/mol=-(-759\,kJ/mol)+(-558\,kJ/mol)+\Delta_{r}H(I^{-}\, hydration)$ $\implies \Delta_{r}H(I^{-}\, hydration)=-63.3\,kJ/mol-759\,kJ/mol+558\,kJ/mol$ $=-264.3\,kJ/mol$
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