Question

A crystalline salt on being rendered anhydrous loses 45.6% of its weight.
The composition of anhydrous salt is : Al = 10.5%, K=15.1%, S=24.8%, and O=
49.6%. calculate the formula of anhydrous salt and crystalline salt ( At. Mass of
Al = 27 , K=39 , S=32, O=16)

Answer 1

Answer:

The percentage composition of anhydrous salt is : Al = 10.5%, K = 15.1%, S = 24.8% and I = 49.6%. Thus, 100 g of anhydrous salt contains 10.5 g Al, 15.1 g K, 24.8 g S and 49.6 g I. ... Hence, the empirical formula of the anhydrous salt is KAlS2I. The empirical formula mass is 39 + 27 + 32 + 32 + 127 = 257 g/mol.

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