Question

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
A. `4 RT`
B. `15 RT`
C. `9 RT`
D. `11 RT`

Answer 1

Correct Answer - D
d. Total internal energy of systme
`U_(o x y g e n) + U_(argo n) = mu_(1) (f_(1))/(2) RT + mu_(2) (f_(2))/(2) RT`
[As `f_(1) = 5` (for oxygen) and `f_(2) = 3` (for argon)]