4. A 9.25 g sample of sodium reacts completely with sulfur to form a compound with a weight of 15.75 g.

Question

I have no clue how to do this problem will some please explain it to me thank you

Answer 1

15.75g = mass Na + mass S
-9.25g = mass Na
----------
6.50 = mass S

mols Na = mass/atomic mass = ?
mols S = mass/atoic mass = ?

Now find the ratio of the two elemenes to each other with the smaller number being no less than 1.00. The esy way to do this is to divide the smaller number by itself, then divide the other number by the same small number. This will give you the empirical formula.