A gas mixture consist of 2 m o l e s of Oxygen and 4 m o l e s of Argon at temperature T . Neglecting all vibrational modes, the total internal energy of the system is

Question

A gas mixture consist of 2 m o l e s of Oxygen and 4 m o l e s of Argon at temperature T . Neglecting all vibrational modes, the total internal energy of the system is, 4 R T, 15 R T, 9 R T, 11 R T

MARKS App · Accepted Answer

Total internal energy of system U = U o x y g e n + U a r g o n U = n 1 f 1 2 R T + n 2 f 2 2 R T Degree of freedom is f 1 = 5 (for Oxygen) and f 2 = 3 (for Argon) U = 2 5 2 R T + 4 3 2 R T U = 5 R T + 6 R T U = 11 R T

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