Engineering
Physics
Thermodynamics
Question

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

15 RT

20 RT

4 RT

12 RT

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Solution

Utotal=UO2+UAr

=3×5×RT2+5×3×RT2

= 15 RT