Two kilograms of air initially at 24ºC expand in an insulated cylinder from a pressure of 800 kPa to 100 kPa. Assuming no friction, the work produced is nearest:
A) 190 kJ
B) 229 kJ
C) 267 kJ
D) 333 kJ
A) 190 kJ
The final temperature is 
The energy equation gives the work (Q = 0): W = ??U = ?mCv (T2 ?T1) = ?2× 0.717× (164 ? 297) =191 kJ
A quasi-equilibrium process is assumed when friction is absent.
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