39. Consider the following numbered processes:ΔH for the process A → 2C + E is
1. A→2B
2. B →C + D
3. E → 2D
(A) ΔH₁+ΔH₂ +ΔH₃
(B) ΔH₁+ΔH₂
(C) ΔH₁+ΔH₂ –ΔH₃
(D) ΔH₁ + 2ΔH₂ –ΔH₃
(E) none of these

考什麼觀念 Hess's Law（赫斯...