The combustion step has a standard entropy change of at 298 K

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

Problem

The combustion step

\text{CO}(g)+\tfrac{1}{2}\,\text{O}_2(g)\rightarrow \text{CO}_2(g)

has a standard entropy change of

\Delta S^{\circ}=-86.4\,\text{J K}^{-1}

at 298 K. Given

S^{\circ}(\text{O}_2)=205.0\,\text{J K}^{-1}\,\text{mol}^{-1}

and

S^{\circ}(\text{CO}_2)=213.7\,\text{J K}^{-1}\,\text{mol}^{-1}

, determine the standard molar entropy

S^{\circ}(\text{CO})

at 298 K. (a)

154\;\text{J K}^{-1}\,\text{mol}^{-1}

(b)

198\;\text{J K}^{-1}\,\text{mol}^{-1}

(c)

95\;\text{J K}^{-1}\,\text{mol}^{-1}

(d)

230\;\text{J K}^{-1}\,\text{mol}^{-1}