Kinetic Theory

JEE Main level, single correct, medium

153 of 168

Question 153 of 168

A gas mixture consists of 33 moles of oxygen and 55 moles of argon at temperature TT. Assuming the gases to be ideal and the oxygen bond to be rigid, the total internal energy (in units of RTRT) of the mixutre is :

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Answer: (A) 1515

f1n1RT12+f2n2RT22\dfrac{{f}_{1}{n}_{1}R{T}_{1}}{2}+\dfrac{{f}_{2}{n}_{2}R{T}_{2}}{2}
=3×52RT+52×3RT=15=3\times \dfrac{5}{2}RT+\dfrac{5}{2}\times 3RT=15

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