$n$ moles of an ideal gas at temperature $T$ (in kelvin) occupy $V \ L$ of volume, exerting a pressure of $P$ atmospheres. What is the concentration (in $mol / L$)?

  • A
    $\frac{P}{RT}$
  • B
    $\frac{PT}{R}$
  • C
    $\frac{RT}{P}$
  • D
    $\frac{R}{PT}$

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