Question

an oxide of phosphorus contains 56.4% phosphorus by mass. What is the empirical formula for this compound?

Answer 1

assume you have 100 grams of the compound. 56.4 are P and (100-56.4)g are oxygen, convert to mass and divide both of them by the one with the least amount of moles. Multiply them by the same number (you have to figure this number out) to make them both integers.

Answer 2

i meant convert to moles* not mass