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

Three moles of an ideal gas expanded spontaneously into vacuum. The work done will be
  1. infinite
  2. $3 \mathrm{~J}$
  3. $9 \mathrm{~J}$
  4. zero

Solution

$W=\mathrm{p}_{\text {ext }} \cdot \Delta \mathrm{V}$ For vacuum, $\quad \mathrm{P}_{\text {ext }}=0$ $\therefore \quad \mathrm{W}=0 \cdot \Delta \mathrm{V}=0$

Asked in: MHT CET Full Test 10

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