Two moles of an ideal gas expand spontaneously into a vacuum. The work done is :-
A
2 joule
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B
4 joule
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C
zero
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D
infinite
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Solution
The correct option is C zero In free expansion there is no resistance to the fluid at system boundary as the volume of fluid increases to fill up the vacuum space. Since, vacuum does not offer any resistance there is no work transfer involved in free expansion.