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Q. How many moles of potassium chlorate should be decomposed completely to obtain $67.2$ litres of oxygen at STP?

Some Basic Concepts of Chemistry

Solution:

$2 KClO _{3} \longrightarrow 2 KCl +3 O _{2}$
$2$ moles of $KClO _{3}$ gives $3 \times 22.4$, that is, $67.2 \,L$ of $O _{2}$.