Question

For an ideal gas undergoing isothermal irreversible expansion:

• A. $\Delta U=0$
• B. $\Delta H=0$
• C. $\Delta S=0$
• D. $w=0$

Answer 1

Answer: (A), (B)

$\Delta H=0$
$\Delta U=0$

For an ideal gas undergoing isothermal irreversible expansion.
$\Delta U=0$ and $\Delta H=0$.
In isothermal process $\Delta T=0$ and $\Delta U=\Delta H=0$
Isothermal process is a process in which although heat enters or leaves the system, yet temperature of the system remains constant throughout the process.