1.

A compound containing carbon, hydrogen and oxygen gave the following analytical data : C=40.0% and H=6.67% Calculate the molecular formula of the compound if its molecular mass is 180.

Answer»

Solution :As crystalline salt on becoming ANHYDROUS loses `51.2%` by mass, this MEANS
48.8 g of anhydrous salt contains `H_(2)O=51.2g`
`THEREFORE"120 g of anhydrous salt contains "H_(2)O=(51.2)/(48.8)xx120=126g=(126)/(18)" molecules = 7 molecules."`
Hence, molecular formula of crysatlline salt = `MgSO_(4).7H_(2)I`


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