ICSE Class 10 Chemistry 2017 Solved Paper

Question : 33 of 86

Marks: +1, -0

A compound of

X

and

Y

has the empirical formula

{\XY}_2

. Its vapour density is equal to its empirical formula weight.
Determine its molecular formula.

Solution:

\;\;\text " Given :V.D.= Empirical formula weight "\;

\;\;\text " Molecular mass "\;=2 × \;\text " V.D. "\;

\;=2 × \;\text " Empirical formula weight "\;

\;n=\;{2 × \;\text " Empirical formula mass "\;}/{\;\text " Empirical formula mass "\;}

\; ∴ \;\; n=2

Molecular formula

\;=(\;\text " Empirical formula "\;)_n

∴ \;\; = ( {\XY}_2) _2

\;= {\X}_2 {\Y}_4

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