21. Consider the following numbered processes:

1. A → 2B ΔH₁

2. B → C + D ΔH₂

3. E → 2D ΔH₃

ΔH for the process A → 2C + E is 

(A) ΔH₁ + ΔH₂ + ΔH₃
(B) ΔH₁ + ΔH₂
(C) ΔH₁ + ΔH₂ – ΔH₃
(D) ΔH₁ + 2ΔH₂ – ΔH₃
(E) ΔH₁ + 2ΔH₂ + ΔH₃

相關試題

相關試卷