What is the mass percent of sodium in NaCl? a)39.34% b)60.66% c)60.66% d)78.68%
2 answers:
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Given :
A certain compound contains 4.0 g of calcium and 7.1 g of chlorine.
Its relative molecular mass is 111.
To Find :
Its empirical and molecular formulas.
Solution :
Moles of calcium , .
Moles of chlorine , .
The ratio calcium and chlorine is 1 : 2 .
So , the empirical formula is .
Now , molecular mass of is :
So ,
Therefore , the molecular formula is also .
Hence , this is the required solution .