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

ICSE Class 10 Chemistry 2016 Paper

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

\;=\;\frac{\;\text{ No. of molecules }\;}{N_A}

\times \;\text{ Molar Volume }\;

\;=\;\frac{12 \times 10^{24}}{6 \times 10^{23} \times 22.4}

\;=\;2 \times 10 \times 22.4

\;=\;448 \;\text{ litres. }\;

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