Sulfur dioxide and nitrogen dioxide react at 298 K298 K via the reaction

SO2(g)+NO2(g)SO3(g)+NO(g)SO2(g)+NO2(g)SO3(g)+NO(g)

A system at equilibrium contains 0.376 mol SO20.376 mol SO2, 0.376 mol NO20.376 mol NO2, 0.703 mol SO30.703 mol SO3, and 0.695 mol NO.0.695 mol NO. O2O2 is added to the container and NONO reacts completely with the O2.O2. Calculate the amount of SO3SO3 in the container after the system returns to equilibrium. What is the mass of SO3SO3?