Which one of the following gases possesses the largest internal energy

Options

A. 2 moles of helium occupying `1m^(3)" at "300K`
B. 56 g of nitrogen at `107Nm^(-2) " at "300 K`
C. 8 g of oxygen at 8 atm at 300 K
D. `6xx10^(26)` molecules of argon occupying `40m^(3)` at 900 K

Answer

D

Explanation

Internal energy, U= number of moles `xx` number of degrees of freedom `xx(1)/(2)RT`
Out of four casses , product of number of moles (1000) degrees of freedom `(3)` and `T(=900K)` is maximum for argon gas .