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  4. The number of oxygen atoms present in 14.6 g of magnesium bicarbonate is

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Q. The number of oxygen atoms present in 14.6 g of magnesium bicarbonate is

Some Basic Concepts of Chemistry

Solution:

Magnesium bicarbonate is $Mg(HCO_{3})_{2}$
$146\,g$ of $Mg(HCO_{3})_{2}$ contains $O$ atoms $=6N_{A}$
$\therefore 14.6\,g$ of $Mg(HCO_{3})_{2}$ contains $O$ atom
$=0.6\, N_{A}$