Final answer:
In the ammonia production reaction, nitrogen and hydrogen gases combine in specific volume ratios to form ammonia gas.
Explanation:
In the reaction to produce ammonia, one volume of nitrogen gas reacts with three volumes of hydrogen gas to produce two volumes of ammonia gas. In this specific case, the initial volumes of NH3 and N₂ gases are 30 cm³ and 15 cm³, respectively. By applying the volume ratio of the reactants to the stoichiometry of the reaction, the mixture ratio before the reaction can be calculated.
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