Question

Determine the mass of sodium fluoride in grams that could be isolated from a 164 g tube of 1504 ppm fluoride toothpaste

Answer 1

Assuming the fluoride in tooth paste is NaF, then

1504 ppm by definition is 1504 mg NaF in 1000 g sample; therefore,
1504 mg NaF x (164 g/1000 g) = 1.50 mg NaF x 164 = 246 mg NaF. Convert that to grams.
In the past several years the fluoride is tooth past comes form NaF AND a few othr fluorides besides NaF.