A gas mixture consists of 2 moles of O _ 2 and 4 moles of Ar at temperature T . Neglecting all vibrational modes, the total internal energy of the system is ( R is universal gas constant)

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Correct answer: D. 11RT

For a gas having n moles of molecules with each f degrees of freedom at temperature TK, internal energy is U = (1)/(2)nfRT ∴ Total internal energy is U = n _ 1 f _ 1 2 RT + n _ 2 f _ 2 2 RT = 2 × (5)/(2)RT + 4 × (3)/(2)RT = 5RT + 6RT U = 11RT

A gas mixture consists of 2 moles of O _ 2 and 4 moles of Ar at...

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