A polyatomic gas with $n$ degrees of freedom has a mean energy per molecule given by
($N$ is Avogadro's number)
A$\frac{{nkT}}{N}$
B$\frac{{nkT}}{{2N}}$
C$\frac{{nkT}}{2}$
D$\frac{{3kT}}{2}$
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C$\frac{{nkT}}{2}$
c
average kinetic energy per molecule $E = \frac{f}{2}kT = \frac{n}{2}kT$
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