1) Find the pressure (in atm) at point C in atmospheres atm. P c = _____________
ID: 2256227 • Letter: 1
Question
1) Find the pressure (in atm) at point C in atmospheres atm.
Pc = _____________ atm
2) Find the heat (in J) exhausted in the process B to C .
Q = __________________ J
3) If the net work done by the engine per cycle is 482.9 J, find the work done by the gas during process C to A.
WCA = ________________ J
A heat engine has the three step cycle shown above. Starting from point A, 1 L (liter) of monatomic ideal gas expands in the isobaric (constant pressure) process A to B at P = 2 atm. B to C is isovolumetric process at V = 5 L, and C to A is an isothermal (constant temperature) compression at 300 K. Find the pressure (in atm) at point C in atmospheres atm. Find the heat (in J) exhausted in the process B to C . If the net work done by the engine per cycle is 482.9 J, find the work done by the gas during process C to A.Explanation / Answer
1)
Pa*Va=Pc*Vc
2*1=Pc*5
Pc = 0.4 atm
2)
heat (in J) exhausted in the process B to C .
q =(Tb-Tc)*(3/2)*R
Va / Ta = Vb / Tb
Tb = Va * Ta / Vb
Tb = 5 * 300 / 1
Tb = 1500
q = 1.5*R*1200
q = 1.5*8.314*1200 = 14.9652 kj
3)
Wab = 2atm(5-1) = 8 atm-liter = 810.6 J
Wnet = Wab - Wac
Wac = 810.6 - 482.9 = 327.7 J
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