ICSE Class 10 Chemistry 2015 Solved Paper

Complete the following calculations. Show working for complete credit :

Question : 13 of 85

Marks: +1, -0

If the empirical formula of a compound is

{\CH}

and it has a vapour density of 13, find the molecular formula of the compound.

Solution:

\;\text " Molecular formula "\;\;= {\CH}

\;\text " V.D. "\;\;=13

\;\text " Mol. Mass "\;\;=2 × \;\text " V.D. "\;

\;=2 × 13=26

Empirical formula weight of

{\CH}

\;=12+1=13

n\;=\;{\;\text " Mol. Mass "\;}/{\;\text " Emp. formula Mass "\;}

\;=\;{26}/{13}=2

Molecular formula

=( {\Emp} . \;\text " formula "\;)_n

=( {\CH})_2= {\C}_2 {\H}_2

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