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 : 60 of 85

Marks: +1, -0

the mass of oxygen present in the cylinder.

Solution:

Let Mass of molecule

=\;{\;\text " No. of Molecules "\;}/{N_A}

× \;\text " Molecular Mass "\;

=\;\;{12 × 12^{24}}/{6 × 10^{23}} ×(2 × 16)

\;=2 × 10 × 32=640 {\g}

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