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)+ 5O2(g)→ 2P2O5(g) In the second step, diphosphorus pentoxide and water react to form phosphoric acid H3PO4: P2O5(g)+ 3H2O(l)→ 2H3PO4(l) Suppose the yield of the first step is 97.% and the yield of the second step is 92.%. Calculate the mass of phosphorus required to make 7.0kg 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)+ 5O2(g)→ 2P2O5(g) In the second step, diphosphorus pentoxide and water react to form phosphoric acid H3PO4: P2O5(g)+ 3H2O(l)→ 2H3PO4(l) Suppose the yield of the first step is 97.% and the yield of the second step is 92.%. Calculate the mass of phosphorus required to make 7.0kg of phosphoric acid. Be sure your answer has a unit symbol, if needed, and is rounded to 2 significant digits.
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
Problem 4.78PAE
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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)+ 5O2(g)→ 2P2O5(g)
In the second step, diphosphorus pentoxide and water react to form phosphoric acid H3PO4:
P2O5(g)+ 3H2O(l)→ 2H3PO4(l)
Suppose the yield of the first step is 97.% and the yield of the second step is 92.%. Calculate the mass of phosphorus required to make 7.0kg of phosphoric acid.
Be sure your answer has a unit symbol, if needed, and is rounded to
2 significant digits.
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