# A Compound of X and Y Has the Empirical Formula Xy2. Its Vapor Density is Equal to Its Empirical Formula Weight. Determine Its Molecular Formula - Chemistry

A compound of X and Y has the empirical formula XY2. Its vapor density is equal to its empirical formula weight. Determine its molecular formula.

#### Solution

Given:
Empirical formula  = XY2
Vapor density  = Empirical formula weight
Molecular formula =?
Molecular weight  = n(Empirical formula weight)

= 2 x V.D.

n(Empirical formula weight) =  2 x V.D.

Since Vapour density Empirical formula weight

n = 2

Molecular formula  = 2(Empirical formula)

= 2(XY2)

Molecular formula = X2Y4

Concept: Deduction of Simple (Empirical) and Molecular Formula from the Percentage Composition of a Compound
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