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

Interpret percentages or areas under the normal curve as probabilities.

Recognize the role of algebra in statistical analysis and the interpretation of data.

Understand the concept of standard scores and how they are adjusted for mean and standard deviation.

Identify the mathematical properties of the normal curve, including symmetry and lack of skew.

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