$A$ sample of an ideal gas occupies a volume $V$ at a pressure $P$ and absolute temperature $T,$ the mass of each molecule is $m.$ The expression for the density of gas is ($k =$ Boltzmann's constant)

  • A
    $mkT$
  • B
    $P/kT$
  • C
    $P/kTV$
  • D
    $Pm/kT$

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