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Q.

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

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a

4 RT

b

5 RT

c

15 RT

d

11 RT

answer is D.

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Detailed Solution

In an ideal gas internal energy=f2nRT 

U=52×2 x RT+4 x 32RT=11 RT

 

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