KAP Grade 11 Science Practice Questions - Kansas Assessment Program Summative Science - Grade 11 Exam

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If 2.0 moles of N2 and 3.0 moles of H2 are mixed to react according to N2 + 3H2 -> 2NH3, which substance is the limiting reactant?

NH3 is the limiting reactant because it is the product being formed. H2 is the limiting reactant because it is completely consumed first. Neither substance is limiting because both are present in equal stoichiometric proportions. N2 is the limiting reactant because it has a smaller initial number of moles.

Correct Answer:

H2 is the limiting reactant because it is completely consumed first.

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