ICSE Class 10 Chemistry 2016 Solved Paper

Question : 62 of 85

Marks: +1, -0

A gaseous hydrocarbon contains

82.76 \%

of carbon. Given that its vapour density is 29 , find its molecular formula.

[C=12, H=1]

Solution:

Volume of molecule

\;=\;{\;\text " No. of molecules "\;}/{ {\N}_{ {\A}}} × \;\text " Molar Volume "\;

\;=\;{12 × 10^{24}}/{6 × 10^{23} × 22.4}

\;=2 × 10 × 22.4

\;=448 \;\text " litres. "\;

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