Two moles of an ideal gas is expanded isothermally and reversibly from 1 litre to 10 litre at 300 K. The enthalpy change (in kJ) for the process is

Question

Two moles of an ideal gas is expanded isothermally and reversibly from 1 litre to 10 litre at 300 K. The enthalpy change (in kJ) for the process is, 11.4 kJ, -11.4 kJ, 0 kJ, 4.8 kJ

MARKS App · Accepted Answer

Δ H = Δ E + P V = Δ E + Δ RT = Δ E + R Δ T For isothermal expansion of ideal gas, Δ E = 0 Δ E = C v Δ T So Δ H = 0 + 0 = 0 Δ T = 0 putting Δ E = C v Δ T , Δ H = C v Δ T + R Δ T = C v + R Δ T = C p Δ T for 1 mole for n moles, Δ H = nCp Δ T = 0

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