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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)xx100=60.6`
60.6 parts of CI (`100%` pure) has 45.5 parts of CI
 Percentage purity of sodium chloride `=(45.5)/(60.6)xx100=75`
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