# A sample of nitrogen gas stored in 4.0L container at 32°C exerts a pressure of 5.0 atm. What is the number of moles of nitrogen gas in the container?

Approx. $0.8$ $m o l$.
$n = \frac{P V}{R T}$ $=$ $\frac{5.0 \cdot \cancel{a t m} \times 4.0 \cdot \cancel{L}}{0.0821 \cdot \cancel{L} \cdot \cancel{a t m} \cdot \cancel{{K}^{-} 1} \cdot m o {l}^{-} 1 \times 305 \cdot \cancel{K}}$ $=$ ??*mol
The only real difficulty with this question is the selection of a gas constant $R$. I think in most examinations, values of $R$ will be given as supplementary problem.