AP Chemistry
9.2 Absolute Entropy and Entropy Change
9.1 Introduction to Entropy
A student mixes equal volumes of \(0.10\text{ M }\text{Pb(NO}_3\text{)}_2\text{(aq)}\) and \(0.20\text{ M }\text{KI(aq)}\) at \(298\text{ K}\), immediately observing the formation of a bright yellow precipitate of \(\text{PbI}_2\text{(s)}\). The net ionic equation for the reaction is shown below.
\[\text{Pb}^{2+}\text{(aq)} + 2\,\text{I}^-\text{(aq)} \rightarrow \text{PbI}_2\text{(s)}\]
Which of the following correctly predicts and justifies the sign of the standard entropy change of the reaction, \(\Delta S^\circ\)?
\[\text{Pb}^{2+}\text{(aq)} + 2\,\text{I}^-\text{(aq)} \rightarrow \text{PbI}_2\text{(s)}\]
Which of the following correctly predicts and justifies the sign of the standard entropy change of the reaction, \(\Delta S^\circ\)?
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