A gas mixture consists of 3 moles of oxygen and 5 moles of argon at temperature T. Assuming the ....

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A gas mixture consists of 3 moles of oxygen and 5
\( \mathrm{P} \)
moles of argon at temperature T. Assuming the
W
gases to be ideal and the oxygen bond to be rigid, the total internal energy (in units of RT) of the mixture is:
(1) 15
(2) 13
(3) 20
(4) 11


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