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# Change in Entropy Calculation

APCHEM-Y1LAUX

What is the change in entropy for the formation of $POCl_{3 (g)}$ from its elements at standard conditions?

Substance at 25 $^{\circ}C$, 1 atm $\Delta H_f$ (kJ/mol) $\Delta G_f$ (kJ/mol) $\Delta S_f$ (kJ/mol-K)
$O_{2(g)}$ 0 0 205
$H_2O_{(I)}$ -286 -237 69.9
$P_{2(g)}$ 144 104 218
$PCl_3$ -288 -270 312
$POCl_3$ -542 -502 325
$S_{(S)}$ 0 0 31.9
$SO_{2(g)}$ -270 -300 249
$SO_{3(g)}$ -395 -370 256
$Cl_{2(g)}$ 0 0 223
$Cl^{-}_{(aq)}$ -167 -131 56.5
A

442 J/mol-K

B

-442 J/mol-K

C

325 J/mol-K

D

-325 J/mol-K