Question

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

Answer 1

Answer:

Given:

Empirical formula = XY2

Vapour density = Empirical formula weight

Molecular formula =?

Molecular weight = n(Empricial formula weight)

= 2 x Vapour density

n(Empirical formula weight) = 2 x Vapour weight

Since, Vapour density = Empirical formula weight

n =2

Molecular formula = 2 (Empirical formula)

= 2(XY2)

Molecular formula = X2Y4

Explanation:

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Answer 2

Answer:

Note... numbers only present in the bottom of the equations.....

Explanation:

It is given that,

The Empirical formula is XY^2.

Then,

Empirical formula= Vapour density

Therefore

n( Empirical formula) = Vapour density

=2* V.D

n ( Empirical Formula weight) = 2* V.D

As the Vapour density = Empirical Formula weight,

n = 2

Molecular weight = 2( Empirical formula) = 2(XY)2

Therefore we get,

Molecular mass = X 2Y 4

Hope this helps you.....