General Chemistry: Principles and Modern Applications (10th Edition)

Published by Pearson Prentice Hal
ISBN 10: 0132064529
ISBN 13: 978-0-13206-452-1

Chapter 19 - Spontaenous Change: Entropy and Gibbs Energy - 19-5 Concept Assessment - Page 850: 19-5

Answer

(1) As represented by Figure 19-9, the conversion of $(H_2O$ $l, 1 atm)$ into $(H_2O$$g, 1 atm)$ is a process whose both $\Delta H$ and $\Delta S$ > 0. (2) Below 100$^{\circ} C$, ($H_2O$ $g, 1 atm)$ is condensed. At 100$^{\circ}C$ , $\Delta G=0$; condensation and vaporization processes are at equilibrium. (3) At 100 $^{\circ}C$, vaporization occurs, $\Delta G<0$, and $T$ $\Delta S$ > $\Delta H$.

Work Step by Step

(1) As represented by Figure 19-9, the conversion of $(H_2O$ $l, 1 atm)$ into $(H_2O$$g, 1 atm)$ is a process whose both $\Delta H$ and $\Delta S$ > 0. (2) Below 100$^{\circ} C$, ($H_2O$ $g, 1 atm)$ is condensed. At 100$^{\circ}C$ , $\Delta G=0$; condensation and vaporization processes are at equilibrium. (3) At 100 $^{\circ}C$, vaporization occurs, $\Delta G<0$, and $T$ $\Delta S$ > $\Delta H$.
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