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Mole concept and Stoichiometry — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryMole concept and Stoichiometry1 Mark
Question
A compound with empirical formula $AB _2$ has the vapour density equal to its empirical formula weight. Find its molecular formula.
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Answer

Now since the empirical formula is equal to vapour density and we know that vapour density is half of the molecular mass i.e. we have $n=2$ so, the molecular formula is $A _2 B_4$.

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