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 syste - Physics MCQ NEET 2017 2026 | ExamTest.live

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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:

Solution & Step-by-step Explanation

Total internal energy U = U_{1} + U_{2} .For n moles of a gas, U = n \frac{f}{2} RT .For O_{2} (diatomic, f = 5): U_{1} = 2 \times \frac{5}{2} RT = 5 RT .For Ar (monatomic, f = 3): U_{2} = 4 \times \frac{3}{2} RT = 6 RT .Total U = 5 RT + 6 RT = 11 RT .

Try it yourself before checking the explanation above.

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:

4 RT

15 RT

9 RT

11 RT

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