Question

Work done on the gas, W, in an irreversible expansion is given by $W=-P_{ext}\times dV$, where $P_{ext}$ is the external pressure and dV is the change in volume of the gas (i.e., $V_{final}-V_{initial}$). What is the value of work done on 1 mole of an ideal gas when it expands into vaccum?

• A. 0 J
• B. 8.314 KJ
• C. 2.27 J
• D. Infinite

Answer 1

The correct option is A 0 J

$W=-P_{ext}\times dVSince,P_{ext}=0,W=0$