Question

For an adiabatic, irreversible, free expansion which of the following is/are true

• A. $\Delta H=0$
• B. $\Delta T=0$
• C. $\Delta U=0$
• D. $\Delta P_{\mathrm{int}}=0$

Answer 1

Answer: (A), (C)

The correct options are
A $\Delta H=0$
C $\Delta U=0$

In an adiabatic process q =0 since it is free expansion so $P_{ext}=0$ so W = 0
hence ΔU = 0
ΔH=ΔU+Δ(PV)=0