Q.

A gas mixture consists of 3 moles of oxygen and 5 moles of argon at temperature T. Assuming the gases to be ideal and the oxygen bond to be rigid, the total internal energy (in units of RT) of the mixture is

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a

11

b

15

c

13

d

20

answer is B.

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Detailed Solution

oxygen bonds are rigid ⇒no vibrational degrees of freedom.U=n1Cv1T +n2Cv2T  ⇒U=352RT+532RT=15RT
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A gas mixture consists of 3 moles of oxygen and 5 moles of argon at temperature T. Assuming the gases to be ideal and the oxygen bond to be rigid, the total internal energy (in units of RT) of the mixture is