In a thermodynamic process, pressure of fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8 J of work is done on the gas. If initial internal energy of the gas was 40 J, what will be final internal energy?
In a thermodynamic process, pressure of fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8 J of work is done on the gas. If initial internal energy of the gas was 40 J, what will be final internal energy?
Option 1 -
18 J
Option 2 -
28 J
Option 3 -
52 J
Option 4 -
32 J
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1 Answer
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Correct Option - 2
Detailed Solution:
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From first law of thermodynamics
From first law of thermodynamics
Given
QAB = +40J
QBC = 0J
QCA = -60J
WCA =?
WBC = -50J (on the gas)
UA = 1560J
1st Law on path A to B
WAB +
Þ 0 +
Þ UB = UA + 40
= 1560 + 40
UB = 1600 J
1st Low
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