O2gA的精选

问题详情： 已知：Fe(s)＋O2(g)===FeO(s)ΔH1=－272kJ/mol2Al(s)＋O2(g)===Al2O3(s)ΔH2=－1675kJ/mol则2Al(s)＋3FeO(s)===Al2O3(s)+3Fe(s)的ΔH是（    ）A．＋859kJ/mol             B．－859kJ/mol   C．－1403kJ/mol  ...