Question

Two moles of an ideal gas is expanded irreversibly and isothermally at `37^(@)C` until its volume is doubled and `3.41 KJ` heat is absorbed from surrounding. `DeltaS_("total")("system +surrounding")` is:
A. `-0.52J//K`
B. `0.52J//K`
C. `22.52J//K`
D. 0

Answer 1

Correct Answer - B
`DeltaS_("system")="nR ln"(V_(2))/(V_(1))`
`=2xxRxx"ln 2"`
= 11.52 J/K
`DeltaS_("surrounding")=-(3.41xx1000)/(310)`
`=-11J//K`
`DeltaS_("total")=+11.52-11`
`=+0.52J//K`