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

Options

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

Answer

A

Explanation

Oxygen is diatomic gas , hence its energy of two moles `=2 xx (5)/(2) RT=5RT `
Argon is a monatomic gas , hence its internal energy of 4 moles `=4 xx (3)/(2) RT=6RT`
Total Internal energy `=(6+5)RT=11RT`