common salt obtained from sea water contains 8.775%Nacl by mass .the no of formula units of Nacl present in 25g of. this salt is
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Let 100g of sea water contains 96g of sodium chloride
So 10g of water would have 9.6 g of sodium chloride
Molar mass of sodium chloride is 35.5+23=58.5g
No of moles in 9.6 g of sodium chloride is 9.6/58.5 moles
No. Of molecules present would be 9.6/58.5*Avogadro number
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