Argon Gas Is Compressed Steadily from 100 KPa and 25°C

Multiple Choice

Argon gas is compressed steadily from 100 kPa and 25°C to 700 kPa at a rate of 0.15 kg/min by an adiabatic compressor. If the compressor consumes 35 kW of power while operating, the isentropic efficiency of this compressor is

A) 6.6%
B) 47%
C) 65%
D) 100%
E) 0.78%