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

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

A

`4RT`

B

`15RT`

C

`9RT`

D

`11RT`

Text Solution

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The correct Answer is:
D
Oxygen isdiatomic gas, hence its energy of two moles `=2xx5/2 RT = 5RT`. Argon is a monoatomic gas, hence its internal energy of 4 moles `=4xx3/2RT = 6RT`.
Total internal energy `=(6+5)RT = 11RT`.
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