The stannous fluoride in a 10.000 g sample of toothpaste was extracted and then precipitated
with lanthanum nitrate solution. if the mass of the precipitate is 0.105 g, what is the per-
centage of stannous fluoride in the toothpaste sample?
3 snf2 (aq) + 2 la(no3)3(aq) —>
laf3(s) + 3 sn(no3)2(aq)

Acm ruler with main graduations from 1 to 10 from left to right there are 10 secondary graduations between each of the main graduations there is a line that begins. at the left end of the ruler 10 secondary graduations to the left of the “1 main graduation the right end of the line ends on the eighth secondary graduation to the right of 3 how long is the line