For the reaction , identify dihydrogen () as a limiting reagent in the following reaction mixtures:

Question

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Strategy:
 Identify the limiting reagent by comparing the mole ratio of the reactants () with the stoichiometric ratio () from the balanced Haber process equation: .

Step 1: stoichiometric condition
Hydrogen () is the limiting reagent if:

Step 2: Evaluate options
- (a) : Equal ratios, no limiting reagent.
- (b)   and  : Ratio . Nitrogen is limiting.
- (c)   and  : Ratio . Hydrogen is limiting.
- (d)   and  : Ratio . Nitrogen is limiting.

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