Question

Three moles of an ideal gas expanded spontaneously into vaccum. The work done will be

• A. 3 Joules
• B. 9 Joules
• C. Zero
• D. Infinite

Answer 1

Answer: (C)

Zero

Answer 2

${W = p_{ext} . \Delta V}$
$\therefore$ W = 0 . $\Delta$ V = 0
For vacuum, $p_{ext} = 0$