AP Chemistry
9.2 Absolute Entropy and Entropy Change
A student evaluating a carbon-capture solvent system compares the following substances at \(298\text{ K}\). The listed phase is used for each substance.
Which of the following ranks the substances from greatest to least standard molar entropy, \(S^\circ\), with the best justification?
| Substance | Formula and phase | Molar mass (\(\text{g/mol}\)) |
|---|---|---|
| Carbon dioxide | \(\text{CO}_2\text{(g)}\) | \(44\) |
| Water | \(\text{H}_2\text{O(l)}\) | \(18\) |
| Methanol | \(\text{CH}_3\text{OH(l)}\) | \(32\) |
| Ethanol | \(\text{C}_2\text{H}_5\text{OH(l)}\) | \(46\) |
Which of the following ranks the substances from greatest to least standard molar entropy, \(S^\circ\), with the best justification?
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