1.

one of an idealgas is expanded isothermally at 298 K unit its volume is tripled. Findthe values ofDelatS_("gas") and DeltaS_("total") under the followingconditions.(i) Expansion is carried outreversiby .(ii)Expansion is carried out irreversiblywhere836.8J of heatis less absorbed than in (i) (iii) Expansionis free.

Answer»


Solution :(i) `DeltaS_(SURR)=0""DeltaS_(gas)=0`
`DeltaS_("TOTAL")= 0`
(ii)`DeltaS_(surr)= (-q_(sys))/(T)`
`q_(IRR) = q_(rev)- 836.8`
`DeltaS_(surr)= -[(q_(rev)-836.8)/(298)]`
`DeltaS_("total")= 2.808 J//K`


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