General Chemistry 10th Edition

Published by Cengage Learning
ISBN 10: 1-28505-137-8
ISBN 13: 978-1-28505-137-6

Chapter 18 - Thermodynamics and Equilibrium - Questions and Problems - Page 772: 18.67

Answer

Please see the work below.

Work Step by Step

We know that the sign of $\Delta S$ should be positive as there is an increase in moles of gas ($\Delta n_{gas}=+5$) which shows that the solid reactant forms five moles of gas. The reaction is exothermic and $\Delta H $ is positive.
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