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由金红石(TiO2)制取单质Ti,涉及到的步骤为:TiO2→TiCl4镁/800℃/ArTi已知:①C(s)+O2(g)=CO2(g);△H=-393.5kJ?mol-1②2CO(g)+O2(g)=2CO2(g);△H=-566kJ?mol-1③TiO2(s)+2Cl2(g)=TiCl4(s)+O2(g);△H=+141kJ?mol-1,则TiO2(s)+2Cl2(g)+2C(s)=TiCl4(s)+2CO(g)的△H=______kJ/mol.
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