One kg of air (R = 287 J/kgK) undergoes an irreversible process between equilibrium state 1 (20 C, 0.9 m3) and equilibrium state 2 (20 C, 0.6 m3). The change in entropy s2 s1 (in J/ kgK) is ______.

One kg of air (R = 287 J/kgK) undergoes an irreversible process betwee

1.	One kg of air (R = 287 J/kgK) undergoes an irreversible process between equilibrium state 1 (20 C, 0.9 m3) and equilibrium state 2 (20 C, 0.6 m3). The change in entropy s2 s1 (in J/ kgK) is ______.
A.	- 116.36 J /kgK
B.	116.36 J /kgK
C.	- 117.36 J /kgK
D.	116.36 J /kgK
Answer» B. 116.36 J /kgK

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