At 298 K the following reactions have the indicated standard entropy changes: (1) (2)…

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

Problem

At 298 K the following reactions have the indicated standard entropy changes: (1)

2\,\text{NO}(g)+\text{O}_{2}(g) \rightarrow 2\,\text{NO}_{2}(g)

\Delta S^{\circ}= -146\;\text{J mol}^{-1}\text{K}^{-1}

(2)

\text{N}_{2}(g)+\text{O}_{2}(g) \rightarrow 2\,\text{NO}(g)

\Delta S^{\circ}= +24\;\text{J mol}^{-1}\text{K}^{-1}

Determine

\Delta S^{\circ}

for the reaction

\text{N}_{2}(g)+2\,\text{O}_{2}(g) \rightarrow 2\,\text{NO}_{2}(g)

Give your answer with units.