
Concept explainers
Interpretation:
The maximum mass of phosphoric acid formed needs to be determined.
The starting mass is 20.0 g of phosphorus, 30 g of oxygen gas, and 15.0 g of water.
Concept Introduction:
The theoretical yield is the maximum amount of product formed in the reaction. The amount of product formed depends on the amount of limiting reactant given in the reaction.

Answer to Problem 61A
The limiting reagent is H2 O and the theoretical yield of H3 PO4 is 54.4g.
This theoretical yield will be the maximum mass of H3 PO4 formed.
Explanation of Solution
The reaction is as follows:
First step is to determine the molar mass of all reactants in the reaction as;
The balanced equation can be expressed as:
The theoretical yield of P4 O10 is determined by the limiting reagent and the excess reagent
And,
The theoretical yield is the one that gives in the smallest proportion and that is determined with the limiting reagent.
The limiting reagent is P4 and the theoretical yield of P4 O10 is 45.8 g.
Now,
Determine the molar mass of all reactants in the reaction
The equation is balanced as follows:
The theoretical yield of P4O10is determined by the limiting reagent and the excess reagent as follows:
The limiting reagent is H2 O and the theoretical yield of H3 PO4 is 54.4g.
This theoretical yield is the maximum mass formed.
Chapter 9 Solutions
World of Chemistry
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