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If the change in entropy of reversible i...

If the change in entropy of reversible isothermal expansion of 1 mol of an ideal gas is `9.135 " J mol"^(-1). K^(-1)`, what will be the entropy change of the surroundings and universe ? If the above expansion of gas is allowed to occur against zero pressure, what will be the entropy change of the system and surroundings ?

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`(i) Delta S_("surr")= -9.135 J . K^(-1) " mol"^(-1)`
`Delta S_(" univ")= Delta S_("sys")+Delta S_("surr")`
`= (9.135-9.135)J. K^(-1) " mol"^(-1)=0`
`(ii) DeltaS_("sys")=+ 9.135 J. K^(-1) " mol"^(-1)`
`Delta S_("surr")=0` (since there occurs no exchange of heat between the system and its surroundings.)
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