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  4. 80 g of oxygen contains as many atoms as in

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Q. $80\,g$ of oxygen contains as many atoms as in

KCETKCET 2008Some Basic Concepts of Chemistry

Solution:

Number of moles of oxygen $=\frac{80}{16}$

Number of atoms of oxygen $=\frac{80}{16} \times N_{0} \times 2$

$=5 \times N_{0} \times 2$

Number of moles of $5 \,g$ of hydrogen $=\frac{5}{1}$

Number of atoms in $5 \,g$ of hydrogen $=5 \times N_{0} \times 2$

Hence, the number of atoms in $80 \,g$ of oxygen is equal to the number of atoms in $5\, g$ of hydrogen.