1.

A gas mixture consists of 2 moles of oxygen and 4 moles of argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

Answer»

4 RT
15 RT
9 RT
11 RT

Solution :`E_(O_(2))=(n_(1)f_(1)RT)/(2)=2XX(5)/(2)xxRT`
`E_(Ar)=(n_(2)f_(2)RT)/(2)=4XX(3)/(2)xxRT`
TOTAL INTERNAL energy of the system is
`E=2xx(5)/(2)RT+4xx(3)/(2)RT=11RT`


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