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For the reaction N₂ + 3H₂ → 2NH₃, ΔH = ?

1. ΔE + 2RT
2. ΔE - 2RT
3. ΔH = RT
4. ΔE - RT

Correct answer: ΔE + 2RT

Solution

The relationship between enthalpy change (ΔH) and internal energy change (ΔE) is ΔH = ΔE + ΔnRT, where Δn is the change in the number of moles of gas. Here, Δn = 2 - (1 + 3) = -2, so ΔH = ΔE + 2RT.

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