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$n g$ 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
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$n+m=p+q$
$\begin{aligned} & n+m=p+q \\ & X_{n g}+Y_{m g} \rightleftharpoons R_{p g}+S_{\ell g}\end{aligned}$
$n+m=p+q$ by law of conservation of mass
$n+m=p+q$ by law of conservation of mass
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