Thermodynamics Question 330

Question: The degrees of freedom per molecule of an ideal gas is 5. Work done by the gas is 100 J when it expands isobarically. The heat absorbed by the gas will be

Options:

A) 250 J

B) 150 J

C) 350 J

D) 200 J

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Degrees of freedom is 5

Hence CV=52RT and CP=72RT

dQdU=nCPdTnCVdT=CPCV

or dQdQdW=75

dQ=3.5dW=3.5(100)

=350J



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