A gas has volume $V$ and pressure $P$. The total translational kinetic energy of all the molecules of the gas is
  • A $\frac {3}{2}\,PV$ only if the gas is monoatomic
  • B $\frac {3}{2}\,PV$ only if the gas is diatomic
  • C $>\frac {3}{2}\,PV$ only if the gas is diatomic
  • D $\frac {3}{2}\,PV$ in all cases
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