On analysing an impure sample of sodium chloride , the percentage of chloride was found to be 45.5 what is the percentage of pure sodium chloride in the sample?

Explanation

Molecular (or Formula )
Mass of pure NaCl = Atomic mass of `Na+`
Atomic mass of Cl
`=23+35.5=58.5 u`
Percentage of chlorine in pure NaCl
`=(35.5 )/(58.5 )xx100 =60.6`
Now , if Chlorine is 60.6 parts , NaCl = 100 Parts
If chlorine is 45.5 parts ,NaCl `=(45.5 )/(60.6 ) xx 100 =75 `
Thus , percentage of pure `NaCl =75 %`