During an isothermal expansion of an ideal gas its Inte

| During an isothermal expansion of an ideal gas, its:

A. Internal energy increases

B. Enthalpy decreases

C. Enthalpy remains unaffected

D. Enthalpy reduces to zero

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We know that the enthalpy can be given as:

$H = U + P V$

$∴$ $Δ H = Δ U + Δ (P V)$

$Δ H = Δ U + Δ (n R T)$

For an isothermal expansion $Δ U = 0$ & $Δ T = 0$

$∴ Δ H = 0$

$∴$ Enthalpy remains unaffected.