半导体工业用石英砂做原料通过三个重要反应生产单质硅SiO2(s)+2C(s)═Si(s)+2CO(g),△H=682.44kJ/mol, (石英砂) (粗硅) Si(s)+2Cl2(s)═SiCl4(g),△H=-657.01kJ/mol,SiCl4(g)+2Mg(s)═2MgCl2(s)+Si(s),△H=-625.63kJ/mol (粗硅) (纯硅) ,生产1.00kg纯硅的总反应热为( )A.2.43×104kJ | B.-2.35×104kJ | C.-2.23×104kJ | D.-2.14×104kJ |
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