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For the reaction C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l) at constant temperature, ΔH = ΔE is

1. -RT
2. +RT
3. -3RT
4. +3RT

Correct answer: -3RT

Solution

ΔH = ΔE + ΔnRT, where Δn is the change in moles of gas. Here, Δn = -3, so ΔH = ΔE - 3RT.

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