A commercial cylinder contains 6.91m3 of O2 at 15M Pa and 21∘C.the cricital constants for O2 are Tc=-126∘C,Pc=50 bar.Determine the reduced pressure and reduced temperature for O2under these conditions:
A
PR=2,TR=3
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B
PR=3,TR=2
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C
PR=6,TR=4
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D
PR=4,TR=6
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Solution
The correct option is BPR=3,TR=2 The reduced pressure π=PPc=150atm50atm=3 The reduced temperature θ=TTc=21+273273−126=294147=2