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Q.

A gas mixture consists of 2 mole of oxygen and 4 mole of argon at temperature T. Neglecting all vibrational modes, the total energy of the system is

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a

4RT

b

15RT

c

9RT

d

11RT

answer is D.

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Detailed Solution

internal energy of n moles of a gas is u=12nfRT  where f= number of degrees of freedom;R is universal gas constant  internal energy of 2 moles of oxygen at temperature T is  u1=12×2×5RT=5RT     (F=5 for oxygen molecule)  total internal energy of 4 moles of argon at temperature T is =u2=12×4×3RT u2=6RT  (f=3 for argon molecule) total internal energy =u1+u2=5RT  +6RT  =11 RT
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A gas mixture consists of 2 mole of oxygen and 4 mole of argon at temperature T. Neglecting all vibrational modes, the total energy of the system is