Phosphoric acid, a mild acid used among other things as a rust inhibitor, food additive, and etching agent for cavity repair by dentists, can be made from elemental phosphorus in a two step process. In the first step, phosphorus and oxygen react to form diphosphorus pentoxide: P4(s) + 50₂(g) 2P₂05 (8) In the second step, diphosphorus pentoxide and water react to form phosphoric acid (H₂PO4): P₂0,(g) + 3H₂O(1) 2 H₂PO4 (1) Suppose the yield of the first step is 66.% and the yield of the second step is 91.%. Calculate the mass of phosphorus required to make 10.0 kg of phosphoric acid. Be sure your answer has a unit symbol, if needed, and is rounded to the correct number of significant digits. - ->

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".