The internal energy of n moles of a gas is
U = nf RT
Where f = number of degrees of freedom.
The internal energy of 2 moles of oxygen at temperature
T is u1 = 1/2 X2 X 5RT = 5RT
(if F = 5, for oxygen molecules)
The total internal energy of 4 moles of argon at temperature T is
U2 =1/2 × 4 × 3RT = 6 RT
Total internal energy = U1 +U2 = 11RT
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