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Kinetic Theory

JEE Main level, single correct, medium

108 of 168

Question 108 of 168

A gas mixture consists of 3 moles of oxygen and 5 moles of argon at temperature T. Considering only translational and rotational modes, the total internal energy of the system is

Show answer and solution

Answer: (A) $15 \mathrm{RT}$

U=\frac{f_{1}}{2} n_{1} R T+\frac{f_{2}}{2} n_{2} R T

Considering translational and rotational modes, degrees of freedom

\mathrm{f}_{1}=5

and

\mathrm{f}_{2}=3

\therefore \mathrm{u}=\frac{5}{2}(3 \mathrm{RT})+\frac{3}{2} \times 5 \mathrm{RT}

\mathrm{U}=15 \mathrm{RT}

JEE Main question paper PDF

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JEE Main 2025 Apr 2 Shift 1 question paper

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JEE Main Physics practice question on Kinetic Theory (Degree of Freedom and Specific Heat), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.