题型:选择题 已知碳、一氧化碳、晶体硅的燃烧热分别是△H =-393.5kJ/mol、△H ="-283" kJ/mol和△H ="-989" kJ/mol,则工业冶炼晶体硅反应2C(s)+SiO2(s)=" Si" (s)+2 CO(g) △H =A.+768 kJ/molB.-768 kJ/molC.+2342 kJ/molD.-2342 kJ/mol 查看答案