For the gaseous reaction involving the complete combustion of isobutene

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$∆ H = ∆ E = 0$

$∆ H < ∆ E$

$∆ H = ∆ E$

$∆ H > ∆ E$

answer is D.

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Detailed Solution

Explanation:

For reactions occurring at constant pressure, the change in enthalpy (ΔH) equals the heat exchanged (q). The change in internal energy (ΔE) is related to the heat exchanged at constant volume.

The difference between ΔH and ΔE is given by ΔH - ΔE = PΔV, where P is pressure and ΔV is the change in volume. In the case of the complete combustion of isobutene, the volume change (ΔV) is zero because the number of moles of gas before and after the reaction remains the same. Therefore, ΔH equals ΔE.

This relationship is consistent with the thermodynamic principles governing reactions at constant pressure and volume.

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