the mass of oxygen present in the cylinder.

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 : 60 of 85

Marks: +1, -0

Solution:

Let Mass of molecule

= \frac{\text{ No. of Molecules }}{N_A}

\times \text{ Molecular Mass }

= \frac{12 \times 12^{24}}{6 \times 10^{23}} \times (2 \times 16)

= 2 \times 10 \times 32 = 640 \text{ g}

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