9. A sample of 20.0 moles of a monatomic ideal gas ( = 1.67) undergoes an adiaba
ID: 3160732 • Letter: 9
Question
9. A sample of 20.0 moles of a monatomic ideal gas ( = 1.67) undergoes an adiabatic process. The initial pressure is and the initial temperature is The final temperature of the gas is What is the heat transfered into or out of the gas? Let the ideal-gas constant R = 8.314 J/(mol • K).
zero (no heat transfer occurs)
54 kJ added to the gas
87 kJ removed from the gas
32 kJ removed from the gas
32 kJ added to the gas
10.
2280 J
2420 J
4850 J
1220 J
485 J
11. An ideal gas changes from a state defined by pressure p1 and volume V1 to a state defined by pressure p2 and volume V2. Which set of properties is independent of the path between the two states?
work and heat transfer involving the gas
heat transfered to or from the gas
change in internal energy of the gas
work performed by or on the gas
2280 J
2420 J
4850 J
1220 J
485 J
11. An ideal gas changes from a state defined by pressure p1 and volume V1 to a state defined by pressure p2 and volume V2. Which set of properties is independent of the path between the two states?
work and heat transfer involving the gas
heat transfered to or from the gas
change in internal energy of the gas
work performed by or on the gas
P 2Pol 217----V %- 2% 0Explanation / Answer
9. In adiabetic process there is no heat transfer occur so
the heat transfered into or out of the gas will be zero
10. work done by the gas in one cycle = area of the cycle = P0V0 = 4 x 3 atm litre = 12 atm litre
Now 1 atm litre = 101.33 Joule
So work done by the gas in joule = 12 x 101.33 = 1216 J
More appropriate answer will be 1220J
11. Internal energy is the state function and does not depends on path
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