1. The problem statement, all variables and given/known data 8 grams of Sulfur is burnt in Oxygen to form SO2 which is oxidized by Chlorine water. The solution is treated with BaCl2 solution. The amount of BaSO4 precipitated is ? 2. Relevant equations SO2 + Cl2 + H2O = SO3 + 2HCl SO3 + HCl + BaCl2 = BaSO4 + HCl I do not know if the second one is right and if right, how to balance it? 3. The attempt at a solution Prima facie it appears that 0.25 mol of S reacts with 0.25 mol of O2 to produce 0.25 mol of SO2. Beyond this, I do not know how to proceed since the second equation is not balanced.