Thermodynamics Question 297

Question: When the state of a gas adiabatically changed from an equilibrium state A to another equilibrium state B an amount of work done on the system is 35 J. If the gas is taken from state A to B via process in which the net heat absorbed by the system is 12 cal, then the net work done by the system is (1cal=4.19J)

Options:

A) 13.2 J

B) 15.4 J

C) 12.6 J

D) 16.8 J

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Answer:

Correct Answer: B

Solution:

[b] In the first-case adiabatic change, ΔQ=0,ΔW=35J From 1st law of thermodynamics, ΔQ=ΔU+ΔW,

In the second case ΔQ=12cal=12×4.2J=50.4J

ΔW=ΔQΔU=50.435=15.4J



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