What is the prefix for the number of atoms of an element when there are four atoms of that element in the compound?

Which answer lists the fundamental forces in order from strongest to weakest

What effect might melting sea ice have for people who live in coastal areas?

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?