AP Chemistry
9.2 Absolute Entropy and Entropy Change
A student evaluates the thermal decomposition of sodium hydrogen carbonate in a gas-generating cartridge. The reaction at \(298\text{ K}\) is represented by the following equation.
\[2\text{NaHCO}_3\text{(s)} \rightarrow \text{Na}_2\text{CO}_3\text{(s)}+\text{CO}_2\text{(g)}+\text{H}_2\text{O(g)}\]
What is the value of \(\Delta S^\circ\) for the reaction as written?
\[2\text{NaHCO}_3\text{(s)} \rightarrow \text{Na}_2\text{CO}_3\text{(s)}+\text{CO}_2\text{(g)}+\text{H}_2\text{O(g)}\]
| Substance | \(S^\circ\) \((\text{J mol}^{-1}\text{K}^{-1})\) |
|---|---|
| \(\text{NaHCO}_3\text{(s)}\) | 102.1 |
| \(\text{Na}_2\text{CO}_3\text{(s)}\) | 135.0 |
| \(\text{CO}_2\text{(g)}\) | 213.8 |
| \(\text{H}_2\text{O(g)}\) | 188.8 |
What is the value of \(\Delta S^\circ\) for the reaction as written?
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