Please help me, will mark brainliest :) 1. If 0.890 g of potassium and 0.590 g of chromium react with 0.727 g of oxygen, what is the empirical formula of the compound?

2. The percentage composition of tin (IV) chloride is 45.9% Sn and 54.1% Cl by mass. What is the empirical formula of tin (IV) chloride? (Hint: Assume you have a 100.0 g sample, and 45.9 g are Sn, and 54.1 g are Cl)

3. The formula of a compound is 184. Analysis of the compound shows that there is 1.216 g of nitrogen and 2.772 g of oxygen in the compound. What is the molecular formula for this compound? (Hint: find the empirical formula first)