Chemistry

Chemistry

Problem

Use the data below, all at 298 K, to calculate the missing standard entropy change. (a) CH4(g)+2 O2(g)→CO2(g)+2 H2O(ℓ)\text{CH}_{4}(g)+2\,\text{O}_{2}(g) \rightarrow \text{CO}_{2}(g)+2\,\text{H}_{2}\text{O}(\ell) ΔS∘=−242  J mol−1K−1\Delta S^{\circ}= -242\;\text{J mol}^{-1}\text{K}^{-1} (b) CO(g)+12 O2(g)→CO2(g)\text{CO}(g)+\dfrac{1}{2}\,\text{O}_{2}(g) \rightarrow \text{CO}_{2}(g) ΔS∘=−174  J mol−1K−1\Delta S^{\circ}= -174\;\text{J mol}^{-1}\text{K}^{-1} (c) CH4(g)+32 O2(g)→CO(g)+2 H2O(ℓ)\text{CH}_{4}(g)+\dfrac{3}{2}\,\text{O}_{2}(g) \rightarrow \text{CO}(g)+2\,\text{H}_{2}\text{O}(\ell) ΔS∘= ?\Delta S^{\circ}=\, ? Calculate ΔS∘\Delta S^{\circ} for reaction (c).

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