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Q. If a mixture containing $3$ moles of hydrogen and $1$ mole of nitrogen is converted completely into ammonia, the ratio of volumes of reactants and products at the same temperature and pressure would be

Equilibrium

Solution:

$N _{2}( g )+3 H _{2}( g ) \rightleftharpoons 2 NH _{3}( g )$
As $4$ moles of reactants form of $2$ moles of product, so ratio of volumes of reactants and products at the same temperature and pressure would be $2: 1$ or $4: 2$.