4.(I) Two moles of an ideal diatomic gas (y = 3) are taken around the cycle of Fig. 21.25. Find: (a) the heat absorbed or rejected in each segment; (b) the work done per cycle; (c) the efficiency. 200 P (kPa) 100 21 5 Isotherm b 10 FIGURE 21.25 Problem 4 -V (L)

4.(I) Two moles of an ideal diatomic gas (y = 3) are taken around the cycle of Fig. 21.25. Find: (a) the heat absorbed or rejected in each segment; (b) the work done per cycle; (c) the efficiency. 200 P (kPa) 100 21 5 Isotherm b 10 FIGURE 21.25 Problem 4 -V (L)

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Question

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4(1) Two moles of an ideal diatomic gas (y = 3) are taken
around the cycle of Fig. 21.25. Find: (a) the heat absorbed
or rejected in each segment; (b) the work done per cycle;
(c) the efficiency.
200
100
P (kPa)
44
Isotherm
b
10
FIGURE 21.25 Problem 4
V (L)

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1. Two moles of a monatomic ideal gas such as helium is compressed adiabatically and reversibly from a state (5.5 atm, 6.5 L) to a state with pressure 6.5 atm. For a monoatomic gas y=5/3. (a) Find the volume of the gas after compression. ✓ final = 5.9 (b) Find the work done by the gas in the process. Latm W= -3.9 (c) Find the change in internal energy of the gas in the process. AE int=39 L.atm. Check: What do you predict the signs of work and change in internal energy to be? Do the signs of work and change in internal energy match with your predictions?
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