A gas mixture consists of 2 moles of O2 and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is
A
15 RT
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B
9 RT
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C
11 RT
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D
15 RT
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Solution
The correct option is C 11 RT Total internal energy U=fO22nO2RT+fAr2nArRT U=52×2RT+32×4RT U=5RT+6RT U=11RT