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A gas mixture consists of 2 moles of oxy...

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

A

4 RT

B

9 RT

C

11 RT

D

15 RT

Text Solution

Verified by Experts

The correct Answer is:
C
For two moles of diatomic oxygen with no vibrational mode.
`U_(1)=2xx5/2RT=5RT`
For four moles of monoatomic Argon,
`U_(2)=4xx3/2RT=6RT`
`thereforeU=U_(1)+U_(2)=5RT+6RT=11RT`
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