- #1
talaroue
- 303
- 0
Homework Statement
A heat engine uses a diatomic gas that follows the pV cycle shown in Figure.
Part 2→3 is adiabat, part 3→1 is isotherm, V=1040 cm3, P=100 kPa, T1=212 K.
Determine the pressure at point 2.
Determine the volume at point 2.
Determine the temperature at point 2.
Find Ws for process 1→2.
Find Q for process 1→2.
Tries 0/9
Find ∆E for process 1→2.
Tries 0/9
Find Ws for process 2→3.
Tries 0/9
Find Q for process 2→3.
0 J
Find ∆E for process 2→3.
Find Ws for process 3→1.
Find Q for process 3→1.
Tries 0/9
Find ∆E for process 3→1.
Tries 0/9
What is the thermal efficiency of this heat engine? (in percent)
Homework Equations
The Attempt at a Solution
I know how to do the rest if I can find the temperature at point 2. I tried 2 different ways.
1. I tried using the Ideal Gas law PV=nRT and solved for mols at pt 1. Then tried using that for point 2 and then used PV=nRT but that didn't work.
2. Then I tried just simply using PV/T=PV/T and came up with the same answer and they are both wrong.
What am I doing wrong?