AP Chemistry
9.6 Free Energy of Dissolution
9.3 Gibbs Free Energy and Thermodynamic Favorability
A student dissolves a sample of solid ammonium nitrate, \(\text{NH}_4\text{NO}_3\text{(s)}\), in distilled water in an insulated container at \(298\text{ K}\) according to the equation below.
\[ \text{NH}_4\text{NO}_3\text{(s)} \rightarrow \text{NH}_4^+\text{(aq)} + \text{NO}_3^-\text{(aq)} \]
The student observes that all the solid dissolves completely and the temperature of the mixture decreases from \(25.0^\circ\text{C}\) to \(15.0^\circ\text{C}\). Based on these observations, which of the following correctly predicts the sign of \(\Delta S^\circ_{\text{soln}}\) and provides the correct justification?
\[ \text{NH}_4\text{NO}_3\text{(s)} \rightarrow \text{NH}_4^+\text{(aq)} + \text{NO}_3^-\text{(aq)} \]
The student observes that all the solid dissolves completely and the temperature of the mixture decreases from \(25.0^\circ\text{C}\) to \(15.0^\circ\text{C}\). Based on these observations, which of the following correctly predicts the sign of \(\Delta S^\circ_{\text{soln}}\) and provides the correct justification?
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