Estimate the minimum work d to compress 2 kg of air in an insulated cylinder from 100 kPa a 27°C to 4 MPa. Assume constant specific heats: Cp = 1.0 kJ/kg·ºC and Cv = 0.717 kJ/kg·ºC.
A) 790 kJ
B) 860 kJ
C) 980 kJ
D) 1100 kJ
A) 790 kJ
Assume an isentropic process to find T2: 
The energy equation: 
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