For which of the following reactions, $\Delta $H is equal to $\Delta $U?

Question

N₂(g) + 3H₂(g) $ \to $ 2NH₃(g)

2HI(g) $ \to $ H₂(g) + I₂(g)

2NO₂(g) $ \to $ N₂O₄(g)

2SO₂(g) + O₂(g) $ \to $ 2SO₃(g)

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