1) how many moles of gas are in the sample? 2) what is the temperature of the ga
ID: 1471024 • Letter: 1
Question
1) how many moles of gas are in the sample?
2) what is the temperature of the gas at point b?
3) what is the work done by gas during the complete cycle?
4) how much heat was added to the gas during the cycle?
ul lle maximum efficieney of a heat engine cat temperatures tlle maximum efficien cy of a heat engine can be expressed in terms Ul cy of a heat engnne TH TL TH where TH is the temperature of the hot reservoir and TL is the ture reservoir (both in kelvins). Th It applies. for example. for an internal combustion auto temperature of low tempera- is expression is independent of the engine's working fluid. engine or a steam eng ne 5.2.2 Prelab Exercise 2 c- a. as shown blow. A sample of an ideal gas is taken through the cyclic process a b-ca. as s The temperature of the gas at point a Ta 298 K. 7.5 (e 3.0 Volume (m) How may moles of gas are in the sample? How many moles of gas are in the sample? 63Explanation / Answer
1.PV = nRT
2.5 * 10 ^3* 1 = n * 8.314 * 298
n = 1.0090 mol
2. temperature of the gas at point b
Pv = nRT
7.5* 10^3 * 3 = 1.090 * 8.314*T
T = 2482.82 K
3.work done by gas during the complete cycle
Wab = area under ab
= 10,000 J
Wbc = 0 { volume remains constant }
Wca = - 5000 J
net workdone = Wab + Wbc +Wca
=2000 J
4. in b to c heat was rejected so total heat is heat rejected in b to c plus total work done
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