ICSE Class 10 Chemistry 2016 Solved Paper

A gas cylinder contains $12 × 10^{24}$ molecules of oxygen gas.
If Avogadro's number is $6 × 10^{23}$ ; Calculate :

Question : 61 of 85

Marks: +1, -0

the volume of oxygen at S.T.P. present in the cylinder.

[O=16]

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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