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

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Chapter15: Equilibria Of Other Reaction Classes
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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

81.%

 and the yield of the second step is 

70.%

. 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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