What is the true regarding complete combustion of gaseous isobutane‐

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What is the true regarding complete combustion of gaseous isobutane‐

ChemistryThermodynamics (C)JEE Main

Options:

A $Δ H = Δ E$
B $Δ H > Δ E$
C $Δ H = Δ E = 0$
D $Δ H < Δ E$

Solution:

2166 Upvotes Verified Answer

The correct answer is:

Δ H < Δ E

C_{4} H_{10} (g) + 6.5 O_{2} (g) \to 4 C O_{2} (g) + 5 H_{2} O_{(l)}

Δ n = [4 - 7.5] = - 3.5

Δ H = Δ E + Δ n_{g} RT

∴ Δ H < Δ E

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