A gas mixture consists of 2 moles of O_2 and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is :

A gas mixture consists of 2 moles of O_2 and 4 moles of Ar at temperat

1.	A gas mixture consists of 2 moles of O_2 and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is :
Answer» 9 RT 4 RT 15 RT 11 RT Solution :The internal energy of 2 MOLES of `O_2` atom is `U_(O_2)=(n_1f_1)/2RT=2xx5/2xxRT` `U_(O_2)=5RT.` The internal energy of 4 moles of Ar atom is `U_(Ar)=(n_2f_2RT)/2=4xx3/2xxRT` `:.` The TOTAL internal energy of the SYSTEM is `U= U_(O_2)+U_(Ar)` `= 5 RT + 6RT = 11 RT.`