The following diagram depicts a gaseous mixture of $\mathrm{O}_2$ (red spheres), $\mathrm{N}_2$ (blue spheres), and $\mathrm{Cl}_2$ (yellow spheres).
Assuming that the gases do not react with each other, what is the total pressure, in atm, in the container if the partial pressure of the $\mathrm{O}_2$ gas is 2.0 atm ?