Use the Standard Reaction Enthalpies Given Below to Determine $D _ { \mathrm { r } }$

Use the standard reaction enthalpies given below to determine $D _ { \mathrm { r } }$ H° for the following reaction: 2S(s) + 3O₂(g) ? 2SO₃(g) _DrH°= ?
Given:
SO₂(g) ? S(s) + O₂(g) _DrH°= +296.8 kJ
2SO₂(g) + O₂(g) ? 2SO₃(g) _DrH°= -197.8 kJ

A) -494.6 kJ mol^-1
B) -692.4 kJ mol^-1
C) -791.4 kJ mol^-1
D) 1583 kJ mol^-1
E) -293.0 kJ mol^-1

Correct Answer:

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