Formation of ${\mathrm{NO}}_2\mathrm{F}$ from ${\mathrm{NO}}_2$and ${\mathrm{F}}_2$ as per the reaction $2{\mathrm{NO}}_2\left(g\right)+{\mathrm{F}}_2\left(g\right)⟶2{\mathrm{NO}}_2\mathrm{F}\left(g\right)$ is a second order reaction, first order with respect to ${\mathrm{NO}}_2$ and first order with respect to ${\mathrm{F}}_2$. If ${\mathrm{NO}}_2$ and ${\mathrm{F}}_2$ are present in a closed vessel in ratio 2 : 1 maintained at a constant temperature with an initial total pressure of 3 atm, what will be the total pressure in the vessel after the reaction is complete?