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)+2CO(g)△H=A．+768kJ/molB．-768kJ/molC．+2342kJ/

Question

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)+SiO ₂ (s)=" Si" (s)+2 CO(g) △H =

A．+768 kJ/mol

B．-768 kJ/mol

C．+2342 kJ/mol

D．-2342 kJ/mol

Answer 1

A