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Physics

Heat

Easy

Question

A gas mixture of 2 moles of oxygen and a 4 mole of Ar at temperature T. Neglecting all vibrations modes, the total internal energy of the system is

4 RT
15 RT
9 RT
11 RT

The correct answer is: 11 RT

$U equals n F over 2 R T equals 2 cross times 5 over 2 R T plus 4 cross times 3 over 2 R T equals 11 R T$

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