For the reaction the standard entropy change at is

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

Problem

For the reaction 2 SO2(g)+O2(g)→2 SO3(g)2\,\text{SO}_{2}(g) + \text{O}_{2}(g) \rightarrow 2\,\text{SO}_{3}(g) the standard entropy change at 298 K298\,\text{K} is ΔS∘=−188 J mol−1 K−1\Delta S^\circ = -188\,\text{J}\,\text{mol}^{-1}\,\text{K}^{-1}. Calculate ΔS∘\Delta S^\circ, to two significant figures, for the reaction 3 SO3(g)→3 SO2(g)+1.5 O2(g)3\,\text{SO}_{3}(g) \rightarrow 3\,\text{SO}_{2}(g) + 1.5\,\text{O}_{2}(g). (a) +5.6×102 J mol−1 K−1+5.6 \times 10^2\,\text{J}\,\text{mol}^{-1}\,\text{K}^{-1} (b) +2.8×102 J mol−1 K−1+2.8 \times 10^2\,\text{J}\,\text{mol}^{-1}\,\text{K}^{-1} (c) −2.8×102 J mol−1 K−1-2.8 \times 10^2\,\text{J}\,\text{mol}^{-1}\,\text{K}^{-1} (d) +1.9×102 J mol−1 K−1+1.9 \times 10^2\,\text{J}\,\text{mol}^{-1}\,\text{K}^{-1}

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