For the reaction 2 CO(g) + O₂(g) → 2 CO₂(g) at 298 K

CHEMISTRY · Single correct · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

For the reaction 2 CO(g) + O₂(g) → 2 CO₂(g) at 298 K, determine Δn_{gas} (moles of gaseous products minus moles of gaseous reactants) and predict the sign of ΔS°. Which choice is most consistent with these values? (a) Δngas=+1;  ΔS∘ expected to be negative\Delta n_{\text{gas}} = +1;\; \Delta S^{\circ}\text{ expected to be negative} (b) Δngas=−2;  ΔS∘ expected to be negative\Delta n_{\text{gas}} = -2;\; \Delta S^{\circ}\text{ expected to be negative} (c) Δngas=−1;  ΔS∘ expected to be negative\Delta n_{\text{gas}} = -1;\; \Delta S^{\circ}\text{ expected to be negative} (d) Δngas=−1;  ΔS∘ expected to be positive\Delta n_{\text{gas}} = -1;\; \Delta S^{\circ}\text{ expected to be positive}

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