Question

What is the percent yield of a reaction in which 200 g of phosphorus trichloride reacts with excess water to form 106 g of HCl and aqueous phosphorous acid (H3PO3)?

Answer 1

Phosphorus trichloride reacts with excess water to form HCl and aqueous phosphorous acid.

200 g of phosphorus trichloride gives 106 g of HCl.

Molecular weight of phosphorus trichloride is 137.33 g/mol

200 g of phosphorus trichloride

The molecular weight of HCl is 36.5 g/mol.

106 g of HCl

1 mole of phosphorus trichloride gives 3 moles of HCl.

1.456 moles of phosphorus trichloride will give moles of HCl.

However only 2.90 moles of HCl are obtained.

Percent yield %