4.
已知:
\(\rm{Fe_{2}O_{3}(s)+3C(}\)石墨\(\rm{)=2Fe(s)+3CO(g)\triangle H=+489.0kJ⋅mol^{-1}}\) \(\rm{①}\)
\(\rm{CO(g)+ \dfrac {1}{2}O_{2}(g)=CO_{2}(g)\triangle H=-283.0kJ⋅mol^{-1}②}\)
\(\rm{C(}\)石墨\(\rm{)+O_{2}(g)=CO_{2}(g)\triangle H=-393.5kJ⋅mol^{-1}③}\)
则\(\rm{4Fe(s)+3O_{2}(g)=2Fe_{2}O_{3}(s)}\)的\(\rm{\triangle H}\)为 ______