1. Consider the following two-step process in an ideal gas. Starting at 2.2 atm,
ID: 1316509 • Letter: 1
Question
1. Consider the following two-step process in an ideal gas. Starting at 2.2 atm, the pressure is reduced to 1.4 atm while the volume is held constant. Then the gas expands at constant pressure from 5.9 L to 9.3 L, where the temperature reaches its starting value. (a) Sketch the process on a P-V diagram. Calculate (b) the total work done, (c) the change in the internal energy & (d) the heat flow in or out.
2. A 750 MW electrical power plant can be modeled as a heat engine operating between a hot reservoir at 300
Explanation / Answer
1)
b)
?P= 1.4 atm= 1.42 x 105 Pa
??V= 9.3 L- 5.9 L= 3.4 L= 3.4 x 10-3 m3
?W= P ?V= +482.8 J (work done by the system)
c)
?Initial and final temperature are the same
?Since ?T=0, then ?U= 0
d)
Q = -W = - 482.8 J
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