Two moles of $\mathrm{CO}{}_2$ ($a=3.59{\mathrm{L}}^2\mathrm{atm}\mathrm{mo}{\mathrm{l}}^{-2}$, $b=0.0427\mathrm{L}\mathrm{mo}{\mathrm{l}}^{-1}$) are kept in a $5.0\mathrm{L}$ vessel at $300\mathrm{K}$. Using the van der Waals equation and $R=0.0821\mathrm{L}\mathrm{atm}{\mathrm{K}}^{-1}\mathrm{mo}{\mathrm{l}}^{-1}$, the pressure in atm (two decimals) is

Numerical answer type, answer in atm, tolerance 0.02.