Using the information below (298 K)

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

Using the information below (298 K), calculate the standard entropy change,

\Delta S^{\circ}

, for the reaction

2\,\text{SO}_{2}(g)+\text{O}_{2}(g) \rightarrow 2\,\text{SO}_{3}(g)

Data: (1)

\text{S}(s)+\text{O}_{2}(g) \rightarrow \text{SO}_{2}(g)

\Delta S^{\circ}_{1}= +248\;\text{J mol}^{-1}\text{K}^{-1}

(2)

\text{S}(s)+\dfrac{3}{2}\,\text{O}_{2}(g) \rightarrow \text{SO}_{3}(g)

\Delta S^{\circ}_{2}= +132\;\text{J mol}^{-1}\text{K}^{-1}

Provide the numerical value of

\Delta S^{\circ}

for the target reaction with units.