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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

4 RT

B

15 RT

C

9 RT

D

11 RT

Text Solution

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The correct Answer is:
D
Total internal energy
`= n _(1) f _(1) ""( RT)/(2) + n _(2) f _(2) ""( RT)/(2)`
`= [( 2 xx 5) + 4 xx 3] (RT)/(2) = 11 RT`
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