Question

What will be the work done by $3\text{moles}$ of an ideal gas when it expands spontaneously in a vacuum?

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

Answer 1

The correct option is A Zero

For a free expansion into a vacuum, a gas does no work, as there is no resistance on the gas as it expands, i.e., $P=0$ and therefore the quantity $-P\Delta V=0$.