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Q. $n\, g$ of substance $X$ reacts with $m \,g$ of substance $Y$ to form $p \,g$ of substance $R$ and $q \,g$ of substance $S$. This reaction can be represented as, $X + Y = R + S$. The relation which can be established in the amounts of the reactants and the products will be

Some Basic Concepts of Chemistry

Solution:

$\underset{n\,g}{X}+\underset{m\,g}{Y} \rightleftharpoons \underset{p\,g}{R}+\underset{q\,g}{S}$

$n+m=p+q$ by law of conservation of mass.