4. ΔU^? of combustion of methane is – X kJ mol^–1. The value of ΔH^? is

(i) = ΔU^?

(ii) > ΔU^?

(iii) < ΔU^?

(iv) = 0      

<p><strong>4.</strong>The chemical equation for the combustion reaction is:</p><p>CH₄&nbsp; (g) + 2O₂&nbsp; (g) →CO₂&nbsp; (g) + 2H₂O (l)</p><p>Δ_ng= 1 – 3 = -2</p><p>ΔH<strong>^?</strong>= ΔU<strong>^?</strong>&nbsp;+ Δ_ngRT = ΔU<strong>^?</strong>- 2RT</p><p>Therefore, ΔH<strong>^{? &nbsp;}&lt;</strong>ΔU<strong>^?</strong></p><p>i.e. option (iii) is correct.</p>

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