Question

For the free expansion of an ideal gas under adiabatic conditions, which of the following is true?

• A. $Q=W=0and \, \Delta U=0$
• B. $Q\neq 0$ , $W=0$ and $ΔU=W$
• C. $Q=0$ , $W\neq 0$ and $ΔU=W$
• D. $Q\neq 0$ , $W\neq 0$ and $ΔU=0$

Answer 1

Answer: (A)

During free expansion of an ideal gas no work is done and also no heat is supplied from outside. Therefore from first law of thermodynamics no change in internal energy.
$Q=W=0and \, \Delta U=0$