1.

The change in entrophyof 2moles of ideal gas uponisothermalexpansion at243.6 Kfrom 20 liter untilthepressurebecomes1 atm, is :

Answer»

1.385 cal/K
`-1.2 cal//K`
`-30 J//mol.K`
None of these

Solution :`DeltaS= nRT In (V_(2))/(V_(1))`
`V_(2) = 40`
`V_(1) = 20`
`DeltaS = 2 XX 2 In 2`
` = 4 In 2 =2.77 cal`


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