SO₂Cl₂ and Cl₂ are introduced into a 3L vessel. Partial pressure of SO₂Cl₂ and Cl₂ at equilibrium are 1atm and 2atm respectively. The value of K_P for the following reaction ${\mathrm{SO}}_2{\mathrm{Cl}}_2\left(\mathrm{g}\right)\rightleftharpoons {\mathrm{SO}}_2\left(\mathrm{g}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)$ is 10. The total pressure in atm at equilibrium would be____.