- #1

- 256

- 29

- Homework Statement:
- see attached

- Relevant Equations:
- PV=nRT

So efficiency is W/Qin.

W= 0 for isochoric processes and for the isobaric, P(change in V). So W=Pi(Vi-Vf)+Pf(Vi-Vf)

Qin is negative Qs.This would happen at step 2 and 3. For the isobaric, Q=ncv(change in T) and for isochoric, Q=ncp(change in T).

Now if I put everything in the equation I get (Pi(Vi-Vf)+Pf(Vi-Vf))/(ncv(change in T)+ncp(change in T))

Now my problem obviously is that I dont know what a single one of these variables are. All I know are the changes in temp from other steps. For instance, the change in T from d to a is 17.4K. But this doesnt exactly help me calculate anything since i dont have mol, volume, or anything at all really.

W= 0 for isochoric processes and for the isobaric, P(change in V). So W=Pi(Vi-Vf)+Pf(Vi-Vf)

Qin is negative Qs.This would happen at step 2 and 3. For the isobaric, Q=ncv(change in T) and for isochoric, Q=ncp(change in T).

Now if I put everything in the equation I get (Pi(Vi-Vf)+Pf(Vi-Vf))/(ncv(change in T)+ncp(change in T))

Now my problem obviously is that I dont know what a single one of these variables are. All I know are the changes in temp from other steps. For instance, the change in T from d to a is 17.4K. But this doesnt exactly help me calculate anything since i dont have mol, volume, or anything at all really.