Problems - Using Equation Editor SHOW all calculations!!! 1. The stannous fluoride in a 10.00 g sample of toothpaste was extracted and then precipitated with lanthanum nitrate solution. 0.105 g of precipitate was collected. What is the mass of SnF2 present in the toothpaste sample? What is the mass percentage of stannous fluoride in the 10.00 g sample of toothpaste? The percentage of SnF2 listed on the box was 1.50%. What does this say about our percent yield of the extraction/recovery process? ​