An unknown compound has an empirical formula of CH₂O, and an Mr of 180.

Find the molecular formula of the compound.

What is the empirical formula of a compound that contains 46.3% lithium and 53.7% oxygen?

(You may need a periodic table)

What is the empirical formula of a compound that contains 15.9% boron and 84.1% fluorine?

Phosphorus reacts with oxygen to give a compound that is 43.7% phosphorus and 56.4% oxygen. What is the empirical formula of the compound?