Q. 385.0( 2 Votes )

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Answer :

o Work done in vacuum is calculated by :

-w = Text (Vinitial - Vfinal )

For the given problem: Pext = 0, because it is a free expansion.

Hence –w = 0x(5-1) = 0.

o For an isothermal expansion, no heat will be absorbed or evolved, hence q=0

By the 1st law of thermodynamics ,

q = ∆U + (-w)

since , both w and q =0 , then the change in internal energy ∆U will also be 0.

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