For the given reactions, A → D; ΔH = x. Steps involved are A → B; ΔH₁ = x₁ B → C; ΔH₂ = ? C → D; ΔH₃ = x₃
- AΔH₂ = x − (x₁ + x₃)
- BΔH₂ = x + x₁ + x₃
- CΔH₂ = x₁ − x₃ − x
- DΔH₂ = (x₁ + x) − x₃
✓ Correct answer: A
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