1. The problem statement, all variables and given/known data SO3 decomposes on heating: 2SO2(g) 2SO2(g) + O2(g) A sample of pure SO3 was heated to a high temperature T. At equilibrium, the mole ratio of SO2 to SO3 was 0.152 and the total pressure was 2.73 atm. If the piston was pushed in to cut the volume in half what is the new pressure? 2. Relevant equations I tried using the ratio to get the pressures on the left. 0.414 and 2.32 respectively.Also tried multiplying 2.73 by 2 but don't think this is the way. 3. The attempt at a solution See above. I got to "an endpoint" with the problem but feel like it's wrong want to learn a general approach. Sorry these are my weakspot!