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A commercial sample of common salt has 4...

A commercial sample of common salt has `45.5%` chlorine. What is the weight percentage of pure sodium chloride in the sample? 

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Formula weight of sodium chloride =23+35.5=58.5
Weight percentage of chlorine in pure sodium chloride
`=(35.5)/(58.5)xx 100=60.6`
60.6 parts of Cl (100% pure) has 45.5 parts of Cl
Percentage purity of sodium chloride `=(45.5)/(60.6) xx 100=75`
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