At constant temperature and pressure which one of the follo…

Chemistry Thermodynamics and Thermochemistry Heat of Reaction Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

At constant temperature and pressure which one of the following statements is correct for the reaction

CO(g) + 1/2O 2 (g) ⎯ ⎯ → → CO 2 (g)

Δ Δ H = Δ Δ E

Δ Δ H < Δ Δ E

Δ Δ H > Δ Δ E

Δ Δ H is independent physical state of reactant

Text Solution

Verified by Experts

The correct answer is:

As we know,

Δ Δ H = Δ Δ E + Δ Δ nRT

Where Δ Δ n = Gaseous product moles – gaseous reactant moles

For the reaction,

CO(g) + 1/2O 2 (g) ⎯ ⎯ → → CO 2 (g)

Δ Δ n = 1–(1+1/2) = –1/2

∴ ∴ Δ Δ H = Δ Δ E – 1/2 RT

∴ ∴ Δ Δ H < Δ Δ E

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