- #1
will_lansing
- 19
- 0
Homework Statement
A heat engine operates between a high-temperature reservoir at 690 K and a low-temperature reservoir at 320 K. In one cycle, the engine absorbs 6700 J of heat from the high-temperature reservoir and does 2200 J of work. What is the magnitude of the net change in entropy as a result of this cycle?
Homework Equations
delta S =Q/T
The Attempt at a Solution
Qh= 6700
Th=690
Qc=Qh-W=6700-2200=4500
Tc=320
delta S= (-6700/690)+(4500/320)= 4.4 J/K
But i got the answer wrong, Where did i make a mistake, did i not round off correctly, or is the formula i used incorrect.