# NEET Physics Thermodynamics Questions Solved

A gas mixture consists of 2 moles of oxygen and 4 moles argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

(1) 4 RT

(2) 15 RT

(3) 9 RT

(4) 11 RT

(4) Oxygen is diatomic gas, hence its energy of two moles $=2×\frac{5}{2}RT=5RT$

Argon is a monoatomic gas, hence its internal energy of 4 moles $=4×\frac{3}{2}RT=6RT$

Total Internal energy = (6 + 5)RT = 11RT

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