Chapter 10, Problem 26PE

Sulfur dioxide and oxygen react according to the equation

${\text{2SO}}_{\text{2}}\text{(}g{\text{)+O}}_{\text{2}}\text{(}g\text{)}\to {\text{2SO}}_{\text{3}}\text{(}g\text{)}$

If 50.0 g of ${\text{SO}}_{\text{2}}\left(g\right)$ is added to a flask resulting in a pressure of 0.750 atm. what will be the total pressure in the flask before and after the reaction when a stoichiometric amount of oxygen is added?