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: →+P4s  5O2g  2P2O5g In the second step, diphosphorus pentoxide and water react to form phosphoric acid  H3PO4 : →+P2O5g  3H2Ol  2H3PO4l Suppose the yield of the first step is  66.%  and the yield of the second step is  62.% . Calculate the mass of phosphorus required to make  2.0kg  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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