How many moles of H 3 PO 4 are produced when 20.0 g of HCI are produced by the reaction PCl 5 +4H 2 O H 3 PO 4 +5HCl ?

Approximately .

Explanation:

Balanced equation for this reaction:

.

Look up the relative atomic mass of and on a modern periodic table:

Calculate the molar mass of :

.

Calculate the number of moles of molecules in that of :

.

In the balanced reaction, the coefficient of and are and , respectively. The ratio between these two coefficients is:

.

In other words, this reaction would produce five times as many molecules as molecules.

Calculation shows that in this question, approximately of molecules were produced. Calculate the number of moles of molecules that were produced:

.

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