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derrickb
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Homework Statement
A piston–cylinder assembly contains air, initially at 2 bar, 300 K, and a volume of 2 m3. The air undergoes a process to a state where the pressure is 1 bar, during which the pressure–volume relationship is pV 5 constant. Assuming ideal gas behavior for the air, determine the mass of the air, in kg, and the work and heat transfer, each in kJ.
Homework Equations
Pv=RT, v=specific volume
W=[itex]\int[/itex]PdV
Q-W=ΔE
The Attempt at a Solution
Pv=RT
(2 bar)(100 kPa/bar)v=(.286)(300 K)
v=0.429 m3/kg
v=V/m
m=V/v
m=2 m3/0.429 m3/kg
m=4.66kg
I feel like this may be incorrect.
W=[itex]\int[/itex]PdV
Would W=0 because PV is constant?
I'm kind of lost at this point. If anyone could point me in the right direction, I would really appreciate it