The table below shows standard entropies, S⊖S^\ominusS⊖, at 298 K.
| Substance | C(s, graphite)\text{C}(\text{s, graphite})C(s, graphite) | H2(g)\text{H}_2(\text{g})H2(g) | O2(g)\text{O}_2(\text{g})O2(g) | CH3OH(l)\text{CH}_3\text{OH}(\text{l})CH3OH(l) |
|---|---|---|---|---|
| S⊖ / J K−1 mol−1S^\ominus\text{ / J K}^{-1}\text{ mol}^{-1}S⊖ / J K−1 mol−1 | 6 | 131 | 204 | 127 |
What is the standard entropy change, ΔS⊖\Delta S^\ominusΔS⊖, in J K−1 mol−1\text{J K}^{-1}\text{ mol}^{-1}J K−1 mol−1, for the standard formation of 1 mol of liquid methanol, CH3OH(l)\text{CH}_3\text{OH}(\text{l})CH3OH(l)?
−486-486−486
−345-345−345
−243-243−243
+243+243+243
24 exam-style questions on OCR A A Level Chemistry Enthalpy and entropy. Each one has a worked solution and a mark scheme showing where the marks go.