The standard entropy change at 298 ,K for the reaction is

CHEMISTRY · Subjective · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

The standard entropy change at 298\,K for the reaction 2 CO (g)+O2 (g)⟶2 CO2 (g)2\,\text{CO}\,(g) + \text{O}_2\,(g) \longrightarrow 2\,\text{CO}_2\,(g) is ΔS∘=−198  J mol−1 K−1\Delta S^{\circ} = -198\;\text{J}\,\text{mol}^{-1}\,\text{K}^{-1}. Using this information, determine ΔS∘\Delta S^{\circ} for the decomposition reaction CO2 (g)⟶CO (g)+12 O2 (g)\text{CO}_2\,(g) \longrightarrow \text{CO}\,(g) + \tfrac12\,\text{O}_2\,(g) at 298\,K. Give your answer in J mol−1 K−1\text{J}\,\text{mol}^{-1}\,\text{K}^{-1} to three significant figures.

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