Question

2 moles of an ideal gas are expanded spontaneously into vaccume. the work done is​

Answer 1

Answer: zero

Explanation: The work done is the product of pressure and change in volume.

W=−PΔV

Since the ideal gas expands spontaneously into vacuum, P  

ext

​  

=0,

Hence work done is also zero.

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Answer 2

Answer:

Whatever be the number of moles expanded,

if it's expanded in vacuum, then we call it Free expansion, and work done is always ZERO.

Reason:

In vacuum, the external pressure is zero. Hence, we know that work done in case of expansion = - PΔV.

Since P = 0, we get work done to be 0.: