已知: 2Fe(s)+O 2(g) =2FeO(s) △ H=-544kJ·mol - 1 4Al(s)+3O 2(g) =2Al 2O 3(s) △ H=-3350kJ·mol - 1 则2Al(s) +3FeO(s) =Al 2O 3(s) + 3Fe(s)的△ H是
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