1. The problem statement, all variables and given/known data For the reaction: 2SO3(g) →2SO2(g)+O2(g) when 2.00 mol of SO3 is added to a flask at 10.0 L and 350 K at fixed volume, at equilibrium the ratio of SO2:SO3 is 0.663. What is the values of the equilibrium constant? What is ΔG° at this temperature? 2. Relevant equations ΔrxnG°=-RTlnK 3. The attempt at a solution I cannot figure out how to find K. I'm thinking I need to find the partial pressures of the various gases in order to get it but I cannot see how to do that.