For the combustion reaction at the standard entropy change is

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

Problem

For the combustion reaction at

298\,\text{K}

\displaystyle \mathrm{C_2H_5OH(l)+3\,O_2(g)\;\rightarrow\;2\,CO_2(g)+3\,H_2O(l)}

the standard entropy change is

\Delta S^{\circ}_{\text{rxn}} = -174\;\text{J\,mol}^{-1}\,\text{K}^{-1}

. The standard molar entropies are

S^{\circ}\!(\mathrm{O_2(g)}) = 205\;\text{J\,mol}^{-1}\,\text{K}^{-1}

S^{\circ}\!(\mathrm{CO_2(g)}) = 214\;\text{J\,mol}^{-1}\,\text{K}^{-1}

, and

S^{\circ}\!(\mathrm{H_2O(l)}) = 70.0\;\text{J\,mol}^{-1}\,\text{K}^{-1}

. Determine the standard molar entropy of ethanol,

\mathrm{C_2H_5OH(l)}

, at

298\,\text{K}