N2 + 3H2 → 2NH3In the above reaction, the limiting reagent is:
Correct answer: B. H2
- A. N2
- B. H2
- C. Ammonia
- D. None of the above
Explanation
The balanced equation is shown below. N2 (g)+ 3H2 (g) → 2NH3 (g) If equal moles of each reactant are used, hydrogen will be the limiting reagent as 3 moles are hydrogen are used up for every one mole of nitrogen to form ammonia.
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
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About Limiting and Excess Reactants
Limiting and excess reactants are identified from the balanced chemical equation and the available amounts of each substance. The limiting reactant determines the maximum product formed, while the excess reactant remains after completion, so questions require mole ratios, theoretical yield and sometimes percentage yield calculations.
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