
Concept explainers
Interpretation:
The statement that the limiting reactant is always the reactant that is present in the smallest amount with respect to mass needs to be classified as true or false.
Concept Introduction:
- A limiting reactant is one that is fully consumed during the course of the reaction.
- It determines the amount of product formed in the reaction

Answer to Problem 70A
False.
Explanation of Solution
The statement that the limiting reactant is always the reactant that is present in the smallest amount with respect to mass needs is False. This is because limiting reagents are deduced based on the molar amounts of each reactant that is present and by comparison to the
Calculations:
The given reaction is:
Consider the following initial amounts of N2 and H2
N2 = 2 g
H2 = 1 g
Step 1: Calculate the moles of N2 as follows:
Mass of N2 = 2 g
Molar mass of N2 = 14 g/mol
Step 2: Calculate the moles of H2 as follows:
Mass of H2 = 1 g
Molar mass of H2 = 2 g/mol
Step 3: The limiting reagent is deduced as follows:
Based on the reaction stoichiometry:
1 mole of N2 reacts with 3 moles of H2
Therefore, 0.1428 moles of N2 will react with:
Since H2 is present in excess, N2 will be the limiting reagent and will determine the amount of product formed.
If the given statement were true, then H2 should be the limiting reagent since it is present in smaller amount by mass. However, as shown above this is not the case.
Therefore, the limiting reactant is always the reactant that is present in the smallest amount with respect to moles.
Chapter 9 Solutions
World of Chemistry, 3rd edition
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