On analysis of an impure example of sodium chloride, the percentage of chlorine was found to be 45.5. What is the percentage of pure sodium chloride in the given sample?

The molecular mass of pure sodium chorine (NaCl)= At. Mass of Na + At. Mass of chlorine = (23 + 35.5) = 58.5% of chlorine is pure NaCl=35.558.5×100=60.6Thus,% of purity of NaCl in the sample =45.560.6×100=75