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During the isothermal expansion of an id...

During the isothermal expansion of an ideal gas, its
internal energy increases
enthalpy decreases
enthalpy remains unaffected
enthalpy reduces to zero.

A

internal energy increases

B

enthalpy decreases

C

enthalpy remains unaffected

D

enthalpy reduces to zero

Text Solution

Verified by Experts

The correct Answer is:
C
We know that,
`H=E+W`
Enthalpy =internal energy + pressure `xx` volume
`H=E+pV`
`DeltaH=DeltaE+Delta(pV)`
`DeltaH=DeltaE+Delta(n_(g)RT) " "(because pV=nRT)`
For isothermal expansion of ideal gas , `DeltaT=0`
`therefore DeltaH=DeltaE`
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