PV Diagram Thermodynamics Question (check my work)? First, I\'d like to know if

Question

PV Diagram Thermodynamics Question (check my work)?

First, I'd like to know if I did everything correctly? Second, my instructor said the "real" efficiency of this engine was ~25%, but I can't figure out how he got that answer. Any help would very appreciated! Thanks!

A hypothetical engine works on 1 mole of a monatomic gas. As diagrammed, this engine is working between two isothermal lines. Assume the process goes from point A to B to C, then returns to A. Fill out the table for one cycle of this engine and calculate the efficiency, both real and ideal. The volume at point A is 1.0 Times 10-3 [m3].

Explanation / Answer

Efficiency=Work done/Heat supplied

Here, work done is sum of all the work done by the engine, ie Wnet=-7400 or 7400J

Heat suuplied is the heat given to the system. the heat given to the system is all the +ve values of Q [-ve values are the heat exhausted by the engine to cald sink]=16500+13600=30100

Efficiency=7400/30100=0.2459

or, 25%

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