# Help with the Carnot Cycle

## Homework Statement

its part VI) of a big problem, where:

0.12 moles of argon (40) undergoes the cycle abca described in the graph. Process ab lies on a 540k isotherm.

In the previious 5 sub problems, i figured that:

Tc=270k
Qbc=670J (lost)
Wab=370J
Wabca=100J

The PV diagram has points a,b and c where:

a=(1.5X10-3, 3.6X105)
b=(3X10-3, 1.8X105)
c=(1.5X10-3, 1.8X105)

## Homework Equations

Q=mc$\Delta$T

$\Delta$U=Q+W

$\epsilon$=1-Qout/Qin=1-Tlow/Thigh

## The Attempt at a Solution

So it's basically using Qabca to find the efficiecy. The thing is that im not sure what to use for the Qs.