1. The problem statement, all variables and given/known data a 4.22g mixture of CaCl2 and NaCl was dissolved, and then treated to precipitate all of the Ca as CaCO3, which was then heated to drive off CO2, leaving a sample of pure CaO which was found to weigh 0.969g. What percentage of the original mixture was CaCl[/SUB]2[/SUB]? I think I know how to solve this question if I just knew the balanced chemical equation for this. 3. The attempt at a solution If i knew the balanced chemical equation, i can just calculate the moles for CaO, then do ratios to find the moles of CaCl2, convert it back to grams and divide over 4.22g to find percentage.