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# Overall Energy Calculation

APCHEM-JLV8QX

Which of the following is the overall energy of the system based on the decomposition of sulfur trioxide gas to form solid sulfur and oxygen gas based on the following thermodynamic data?

Substance at 25$^\circ$ C, 1 atm $\Delta H_f$ (kJ/mol) $\Delta G_f$ (kJ/mol) S (kJ/mol)
$O_{2(g)}$ 0 0 205
$H_{2}O_{(l)}$ -286 -237 69.9
$P_{2(g)}$ 144 104 218
$PCl_{3(g)}$ -288 -270 312
$POCl_{3(g)}$ -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

370 kJ/mol

B

-370 kJ/mol

C

740 kJ/mol

D

-740 kJ/mol