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?

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.