Calculate ?S° for the Dissolution of BaCl₂ in Water at 25°C

question 20

Multiple Choice

Calculate ?S° for the dissolution of BaCl₂ in water at 25°C. BaCl₂(s) ? Ba²⁺(aq) + 2Cl?(aq)
$\begin{array}{lll}\text { Substance } & \Delta G_{\mathrm{f}}^{\circ}(\mathrm{kJ} / \mathrm{mol}) & \Delta H_{\mathrm{f}}^{0}(\mathrm{~kJ} / \mathrm{mol}) \\\hline \mathrm{BaCl}_{2}(s) & -810.4 & -858.6 \\\mathrm{Ba}^{2+}(a q) & -560.8 & -537.6 \\\mathrm{Cl}-(a q) & -131.2 & -167.2\end{array}$

• A) ?0.20 kJ/K
• B) ?0.14 kJ/K
• C) ?0.0020 kJ/K
• D) +0.12 kJ/K
• E) +0.29 kJ/K

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