ICSE Class 10 Chemistry 2023 Solved Paper

Question : 63 of 88

Marks: +1, -0

The Empirical formula of an organic compound is

{\CHCl}_2

.
If its relative molecular mass is 168 , what is its molecular formula?
[At. Wt.

{\C}=12, {\H}=1, {\Cl}=35.5

]

Solution:

Empirical formula of organic compound

= {\CHCl}_2

Mass of

{\CHCl}_2

\;=12+1+35.5 × 2

\;=84 {\amu} .

Relative molecular mass

=168

Molecular formula

=

?
Multiplication factor

(n)

\;=\;{\;\text " Relative molecular mass "\;}/{\;\text " Empirical formula mass "\;}

\;=\;{168}/{84}=2

Molecular formula

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

\;= ( {\CHCl}_2) _2= {\C}_2 {\H}_2 {\Cl}_4

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