To which one of the following reactions, occurring at 25oC, does the symbol ΔHof [H2SO4(l)] refer?
H2(g) + S(s) + 2 O2(g) ----> H2SO4(l)
H2SO4(l) ----> H2(g) + S(s) + 2 O2(g)
H2(g) + S(g) + 2 O2(g) ----> H2SO4(l)
H2SO4(l) ----> 2 H(g) + S(s) + 4 O(g)
2 H(g) + S(g) + 4 O(g) ----> H2SO4(l)
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