Two of them give the same exact answer while the third one gives a different answer I don't know why.

For adiabatic air compression, I found these two expressions which give different answer as well I don't know why

Let's say we have a 11 kWh to be stored, P0 = 101325 Pa, P1 = 6.3 bar, P2 = 10 bar, and T0= 298 K. What would be the required air vessel volume?