Suppose 0.500 g of sulfur combines with 1.00 g of copper. What is the empirical formula of the compound? The atomic mass of sulfur is 32.065 g and the atomic mass of copper is 63.546 g.

Answer 1

Convert grams to mols.
mols S = grams/atomic mass = ?
mols Cu = grams/atomic mass = ?

Now you want to find the ratio of the elements to each other with the smallest number being 1.00. The easy way to do this is to divide the smaller number by itself (thereby assuring 1.00 for that one), then divide the other number by the same small number. Round to whole numbers and that should give you the empirical formula. Post your work if you run into trouble.