# A 75.0 mL steel reaction vessel is filled with oxygen gas (O2) until the pressure reads 145 atm at 22C. How many moles of oxygen are in the container?

Sep 6, 2017

Assuming ideality.....then approx. half a mole.......of ${O}_{2}$..
We assume ideality, and thus $n = \frac{P V}{R T}$
$= \frac{145 \cdot a t m \times 75.0 \cdot m L \times {10}^{-} 3 \cdot L \cdot m {L}^{-} 1}{0.0821 \cdot \frac{L \cdot a t m}{K \cdot m o l} \times 295.15 \cdot K}$
=??*mol