86.4 g of an unknown compound containing iron, phosphorus and oxygen, was analyzed to contain 40.5 g of iron and 14.9 g of phosphorus. What mass of oxygen is present in the sample?

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

Chemistry worksheet - i am not sure what they are asking for exactly?