To calculate theoretical and percent yields, given the masses of multiple reactants.

A balanced chemical reaction gives the mole ratios between reactants and products. For example, one mole of white phosphorus, P4 , reacts with five moles of oxygen, O2 , to roduce two moles of diphosphorus pentoxide, P2O5 :

A. What is the maximum number of moles of P2O5 that can theoretically be made from 112 g of P4 and excess oxygen?

Express your answer to three significant figures and include the appropriate units.

B. What is the maximum number of moles of P2O5 that can theoretically be made from 112 g of O2 and excess phosphorus?

Express your answer to three significant figures and include the appropriate units.