Question

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Answer 1

Both enthalpy and entropy remain constant.

During isothermal expansion, temperature, as well as pressure, remains constant. So, enthalpy remains constant,

ΔS= Δq/T

where Δq=ΔH

⇒entropy is also constant,

Where ΔS= ΔH/T

Answer 2

Answer:

For an ideal gas undergoing isothermal irreversible expansion.

ΔU=0 and ΔH=0.

In isothermal process ΔT=0 and ΔU=ΔH=0

Isothermal process is a process in which although heat enters or leaves the system, yet temperature of the system remains constant throughout the process.

Hope it helpss!