A gas mixture consists of $3$ moles of oxygen and $5$ moles of argon at temperature $T$. Assuming the gases to be ideal and the oxygen bond to be rigid, the total internal energy (in units of $RT$ ) of the mixture is
A$11$
B$15$
C$20$
D$13$
JEE MAIN 2020, Medium
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B$15$
b $u =\frac{ f _{1} n _{1} RT }{2}+\frac{ f _{2} n _{2} RT }{2}$
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