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3.已知下列数据:
2Fe(s)+O2(g)===2FeO(s) ΔH=-544 kJ.mol-1
4Al(s)+3O2(g)===2Al2O3(s) ΔH=-3 350 kJ.mol-1
则2Al(s)+3FeO(s)===Al2O3(s)+3Fe(s)的ΔH是 ( )
A.-859 kJ.mol-1 B.+859 kJ.mol-1
C.-1 403 kJ.mol-1 D.-2 491 kJ.mol-1