A 1.00 mol sample of an ideal monatomic gas is taken through the cycle shown in the figure. The process A B is a reversible isothermal expansion where PA = 5.0 atm, PB = 3.0 atm, VA = 30.0 L, and VB = 50.0 L.
(a) Calculate the net work done by the gas.
(b) Calculate the energy added to the gas by the heat.
(c) Calculate the energy exhausted from the gas by heat.
(d) Calculate the efficiency of the cycle.
The Attempt at a Solution
started by calculating tamp at point A using (pressureA*VolumeA)/number of moles*gas constant, that came to 1822.2K
then used work=nRT ln(VA/VB) think that came to -7.74kj
next step W2=PB(VB-VC) which i got 6.06kj as answer
so net work done 7.74-6.06=1.68
for the following parts used Q2=n(5/2)R(Tc-Tb) to show energy exhausted
and Q3=n(3/2)R(Tb-Tc) combined this with W1=Q1 to get energy added
at some point i have made an error please help