1. Δ H + Δ U = Δ nR 2. Δ H = Δ U - Δ n_g RT 3. Δ H = Δ U + Δ n_g RT 4. Δ H - Δ U = -Δ nRT

Answer: 3. Δ H = Δ U + Δ n_g RT Key idea: H = U + PV , so at constant T and P, Δ H = Δ U + PΔ V = Δ U + Δ n_g RT . Here Δ n_g is the change in moles of gas. Option 3.

Topic: First law: work, heat, internal energy, enthalpy· Chemical Thermodynamics

Which amongst the following options is the correct relation between change in enthalpy and change in internal energy?

1. \(\Delta H + \Delta U = \Delta nR\)

2. \(\Delta H = \Delta U - \Delta n_g RT\)

3. \(\Delta H = \Delta U + \Delta n_g RT\)

4. \(\Delta H - \Delta U = -\Delta nRT\)

Doubtly Asked 30 Oct 2026 NEET UG 2023 Practice test neet Save WhatsApp Report

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Answer: 3. \(\Delta H = \Delta U + \Delta n_g RT\)

Key idea: \(H = U + PV\), so at constant T and P, \(\Delta H = \Delta U + P\Delta V = \Delta U + \Delta n_g RT\).

Here \(\Delta n_g\) is the change in moles of gas. Option 3.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which amongst the following options is the correct relation between change in enthalpy and change in internal energy?

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