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Question

A crystalline hydrated salt on being rendered anhydrous loses 45.6% of its weight.
The percentage composition of the anhydrous salt is:
Al=10.5%, K=15.1%, S=24.8% and oxygen =49.6%
[Molar mass of Al=27,K=39,S=32].

What is the empirical formula of the salt?

A
K2AlS2O7
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B
K2Al2S2O7
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C
KAlS2O8
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D
K3AlS2O12
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