Phosphoric acid, which is commonly used as rust inhibitor, food additive and etching agent for dental and orthopedic use, can be synthesized using a two-step thermal process. in the first step, phosphorus and oxygen react to form diphosphorus pentoxide: (l)(g)(g) in the second step, diphosphorus pentoxide and water react to form phosphoric acid: (g)(l)(l) write the net chemical equation for the production of phosphoric acid from phosphorus, oxygen and water. be sure your equation is balanced.