Answer to Question #131589 in General Chemistry for Jazmyne Daniels

Question

Many brands of toothpaste contain about 1.0 mg of fluoride per 1 g of toothpaste. The fluoride compound that is most often used in toothpaste is sodiumfluoride (NaF) which is 45% fluoride by mass. How many mg of NaF are in a 200 g tube of toothpaste?

Answer 1

If 1 gram of toothpaste contains 1.0 mg of fluorine, then 200 g contain 200.0 mg.

m (NaF) = 200.0 / 0.45 = 444.4 mg

Answer: 444.4 mg