At 298 K the standard entropy change for the reaction is

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

Problem

At 298 K the standard entropy change for the reaction

2\,\text{SO}_2(g)+\text{O}_2(g)\rightarrow 2\,\text{SO}_3(g)

\Delta S^{\circ}=-188.5\,\text{J K}^{-1}

. The absolute molar entropies of

\text{SO}_2(g)

and

\text{O}_2(g)

are 248.1

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

and 205.0

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

, respectively. What is the standard molar entropy

S^{\circ}(\text{SO}_3)

at 298 K? (a)

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

(b)

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

(c)

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

(d)

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