What is the molecular formula of aluminum chloride containing 20.2% by mass of aluminum and 79.8% My mess of chlorine. The relative molecular mess is 267 g.

The molecular formula : Al₂Cl₆

Given

20.2% by mass of Aluminum and 79.8% by mass of Chlorine.

Required

the molecular formula

Solution

Aluminium (Ar=27 g/mol)

Chlorine(Ar=35.5 g/mol)

mol ratio Al : Cl =

So the empirical formula = AlCl₃

(Empirical formula)n=Molecular formula

(27+3.35.5)n=267

(133.5)n=267⇒n=2

The molecular formula : Al₂Cl₆

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