Multiple Choice
Determine the theoretical yield of H2S (in moles) if 48 mol Al2S3 and 48 mol H2O are reacted according to the following balanced reaction: Al2S3(s) + 6 H2O(l) → 2 Al(OH)3(s) + 3 H2S(g).
3. Chemical Reactions
Stoichiometry
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For the reaction 3A + 2B + C → 2D, if 5.7 mol of A, 3.2 mol of B, and 2.5 mol of C are mixed, which reactant is the limiting reactant?
A
C
B
D
C
B
D
A
Verified step by step guidance1
Start by understanding the concept of a limiting reactant: it is the reactant that is completely consumed first in a chemical reaction, limiting the amount of product formed.
Write down the balanced chemical equation: .
Calculate the mole ratio of each reactant based on the balanced equation. For A, the ratio is 3:2:1 (A:B:C).
Determine how many moles of each reactant are required to completely react with the given moles of the other reactants. For example, calculate how many moles of B and C are needed to react with 5.7 moles of A using the ratios from the balanced equation.
Compare the calculated required moles of each reactant to the available moles. The reactant for which the available moles are less than the required moles is the limiting reactant.
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