Chapter 5, Problem 79IAE

A method of producing phosphine, ${\text{PH}}_{\text{2}}\text{,}$ from elemental phosphorus, ${\text{P}}_{\text{4,}}$ involves heating the ${\text{P}}_{\text{4,}}$ with H₂O. An additional product is phosphoric acid, ${\text{H}}_{\text{2}}{\text{PO}}_{\text{4}\text{.}}$ Write a balanced equation for this reaction.