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`        Common salt obtained from seawater contains 8.775% NaCl by mass. The number of formula unit of NaCl present in 25 gram of the salt is:A. 3.367×10^23 formula unit B. 2.258×10^22 formula unit C. 3.176×10^23 formula unit D. 4.775×10^23 formula unit`
one year ago

Arun
18601 Points
```							Dear Akash Let 100g of sea water contains 8.775g of sodium chlorideSo 25g of water would have 2.19375g of sodium chloride  Molar mass of sodium chloride is 35.5+23=58.5g No of moles in 2.19375 g of sodium chloride is 2.19375/58.5 molesNo. Of molecules present would be (2.19375/58.5)*Avogadro number  = 2.19375* 6* 10^23/(58.5)  = 2.25 * 10^22 units  RegardsArun (askIITians forum expert)   RegardsArun (askIITians forum expert)
```
one year ago
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