Question

an impure sample of potassium chloride contains 38% of chlorine calculate the percentage of purity of the given sample

Answer 1

A pure sample of Kcl should contain 35.5/74.5 ×100 = 47.65% Of Cl

But this sample contains only 38% of Cl

So the % purity = 38/47.65×100

                         = 79.74%