Question

已知：①C（s）+1/2O₂（g）CO（g）?ΔH₁=-110.35 kJ·mol^-1?

②CO（g）+1/2O₂（g）CO₂（g）?ΔH₂=-282.57 kJ·mol^-1?

③C（s）+O₂（g）CO₂（g）　ΔH₃?

ΔH₃等于(    )?

A.+172.22 kJ·mol^-1                                    B.-172.22 kJ·mol^-1?

C.+392.92 kJ·mol^-1                                    D.-392.92 kJ·mol^-1

Answer 1

解析：由盖斯定律可知③=①+②?

所以ΔH₃=-110.35 kJ·mol^-1-282.57 kJ·mol^-1=-392.92 kJ·mol^-1。?

答案：D