$n$ moles of an ideal gas at temperature $T$ (in kelvin) occupy $V \mathrm{~L}$ of volume, exerting a…
$n$ moles of an ideal gas at temperature $T$ (in kelvin) occupy $V \mathrm{~L}$ of volume, exerting a pressure of $P$ atmospheres. What is the concentration (in $\mathrm{mol} / \mathrm{L}$ ) ?
$\frac{P}{R T}$
$\frac{P T}{R}$
$\frac{R T}{P}$
$\frac{R}{P T}$
Solution
$\begin{aligned} & P V=n R T \\ & \qquad \begin{aligned} V & =\frac{P}{R T} \\ \text { Concentration } & =\frac{P}{R T}\end{aligned}\end{aligned}$