What is the percent by mass of fluorine in CaF₂?

(Ca = 40.08 g/mol, F = 19.00 g/mol)

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

(Cu = 63.55 g/mol, O = 16.00 g/mol)

You are given the following percentages: 40.05% S and 59.95% O.

(S = 32.07 g/mol, O = 16.00 g/mol)

Find the empirical formula for these elements so that you can give the correct name of the compound formed.

A chemical formula that shows the actual number and kinds of atoms present in one molecule of a compound is called_________

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

(C = 12.01 g/mol, H = 1.01 g/mol, O = 16.00 g/mol)