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For which reaction is ∆H°rxn equal to ∆H°f of CaSO3(s)? — Thermodynamics Chemistry Question

Question

For which reaction is ∆H°rxn equal to ∆H°f of CaSO3(s)?

A.

Ca(s) + 1/8 S8(s) + 3/2 O2(g) → CaSO3(s)

✓ Correct
B.

8 Ca(s) + S8(s) + 12 O2(g) → 8 CaSO3(s)

C.

8 Ca(s) + S8(g) + 12 O2(g) → 8 CaSO3(s)

D.

CaO(s) + SO2(g) → CaSO3(s)

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