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# For an ideal gas, average kinetic energy per degree of freedom is?

(A) $\large\frac{1}{2}$$RT (B) \large\frac{3}{2}$$ RT$ (C) $\large\frac{5}{2} $$RT (D) \large\frac{7}{2}$$RT$

Each gas atom has three degrees of translational freedom, along x, y, or z.
The average energy then per degree of freedom for the translating atomic gas is 1/2 kT per degree of freedom per gas atom or 1/2 RT per degree of freedom per mole of gas atoms.