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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) + 50,(g) 2 P,05 (g) In the second step, diphosphorus pentoxide and water react to form phosphoric acid (H,PO,): P2O3(g) + 3H,0(1) 2 H,PO4 (1) Suppose the yield of the first step is 90.% and the yield of the second step is 66.%. Calculate the mass of phosphorus required to make 4.0 kg of phosphoric acid. Be sure your answer has a unit symbol, if needed, and is rounded to 2 significant digits.

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) + 50,(g) 2 P,05 (g) In the second step, diphosphorus pentoxide and water react to form phosphoric acid (H,PO,): P2O3(g) + 3H,0(1) 2 H,PO4 (1) Suppose the yield of the first step is 90.% and the yield of the second step is 66.%. Calculate the mass of phosphorus required to make 4.0 kg of phosphoric acid. Be sure your answer has a unit symbol, if needed, and is rounded to 2 significant digits.

Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter4: Stoichiometry
Section: Chapter Questions
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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) 2 P,0, (g) In the second step, diphosphorus pentoxide and water react to form phosphoric acid (H,PO, P,0,(g) + 3H,0(1) 2 H,PO4 (1) Suppose the yield of the first step is 90.% and the yield of the second step is 66.%. Calculate the mass of phosphorus required to make 4.0 kg of phosphoric acid. Be sure your answer has a unit symbol, if needed, and is rounded to 2 significant digits. x10
Transcribed Image Text: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) 2 P,0, (g) In the second step, diphosphorus pentoxide and water react to form phosphoric acid (H,PO, P,0,(g) + 3H,0(1) 2 H,PO4 (1) Suppose the yield of the first step is 90.% and the yield of the second step is 66.%. Calculate the mass of phosphorus required to make 4.0 kg of phosphoric acid. Be sure your answer has a unit symbol, if needed, and is rounded to 2 significant digits. x10
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