A
B
C
D
2SO2(g)+O2(g)⇌2SO3(g) ∆H=-akJ/mol
N2(g)+3H2(g) ⇌2NH3(g) ∆H=-bkJ/mol
N2O4(g)⇌2NO2(g) ∆H=+ckJ/mol
CO2(g)+C(s) ⇌2CO(g) ∆H=+dkJ/mol
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