Using the data below

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

Problem

Using the data below, determine the standard entropy change,

\Delta S^{\circ}

, for the combustion of propane at 298\,K.

\text{C}_3\text{H}_8\,(g) + 5\,\text{O}_2\,(g) \longrightarrow 3\,\text{CO}_2\,(g) + 4\,\text{H}_2\text{O}\,(l)

Standard molar entropies:

S^{\circ}(\text{C}_3\text{H}_8\,(g)) = 270\;\text{J}\,\text{mol}^{-1}\,\text{K}^{-1}

S^{\circ}(\text{O}_2\,(g)) = 205\;\text{J}\,\text{mol}^{-1}\,\text{K}^{-1}

S^{\circ}(\text{CO}_2\,(g)) = 214\;\text{J}\,\text{mol}^{-1}\,\text{K}^{-1}

S^{\circ}(\text{H}_2\text{O}\,(l)) = 70.0\;\text{J}\,\text{mol}^{-1}\,\text{K}^{-1}

Report

\Delta S^{\circ}

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

to two significant figures.