Question

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

(1) 12 RT
(2) 20 RT
(3) 15 RT
(4) 4 RT

#clear explanation
#full answer with steps ​

Answer 1

ANSWERU=

2f 1 n 1 RT+ 2f 2

n 2 RT= 25 (3RT)+ 23 ×5RTU=15RT

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