The reaction has

CHEMISTRY · Subjective · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry

Problem

The reaction

\mathrm{CO(g) + \dfrac12\,O_2(g) \rightarrow CO_2(g)}

has

\Delta S^{\circ}_{298}=+86.6\;\text{J\,mol}^{-1}\,\text{K}^{-1}

. What is

\Delta S^{\circ}_{298}

(including sign) for the reaction

\mathrm{CO_2(g) \rightarrow CO(g) + \dfrac12\,O_2(g)}