7-230 Air is to be compressed steadily and isentropically from 1 atm to 25 atm by a two-stage compressor. To minimize the total compression work, the intermediate pressure between the two stages must be
a) 3 atm (
b) 5 atm (
c) 8 atm
d) 10 atm
e) 13 atm
 
 
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