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Question
A gas absorbs 80 cal of heat. If the work done by the gas is 150 J, the change in internal energy is:
A gas absorbs 80 cal of heat. If the work done by the gas is 150 J, the change in internal energy is:
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Solution
The correct option is C 186 J
According to the first law of thermodynamics, ΔU=Q+W
Now, 80 cal will be equal to (80×4.2)= 336 joules.
Work done, W=−150 J
Substituting the values in the equation will give ΔU equal to +186 J.
Option C is correct.
According to the first law of thermodynamics, ΔU=Q+W
Now, 80 cal will be equal to (80×4.2)= 336 joules.
Work done, W=−150 J
Substituting the values in the equation will give ΔU equal to +186 J.
Option C is correct.
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