Limiting Reactant and Excess Reactant Calculations
Chemistry ⇒ Stoichiometry and Chemical Calculations
Limiting Reactant and Excess Reactant Calculations starts at 11 and continues till grade 12.
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A reaction requires 2 moles of A for every 3 moles of B. If you have 4 moles of A and 9 moles of B, which reactant is in excess?
Context: 10.0 g of Ca reacts with 10.0 g of O2 to form CaO. Which is the limiting reactant? (Atomic masses: Ca = 40, O = 16)
Context: 2Na + H2SO4 → Na2SO4 + H2. If 4.6 g Na reacts with 9.8 g H2SO4, which is the limiting reactant? (Na = 23, H = 1, S = 32, O = 16)
Context: 5.0 g of Mg reacts with 10.0 g of HCl to form MgCl2 and H2. Which is the limiting reactant? (Mg = 24, H = 1, Cl = 35.5)
Context: 6.0 g of C2H6 reacts with 16.0 g of O2 to form CO2 and H2O. Which is the limiting reactant? (C = 12, H = 1, O = 16)
Context: 7.0 g of N2 reacts with 3.0 g of H2 to form NH3. What is the limiting reactant? (N = 14, H = 1)
Context: In the reaction 2Al + 3Br2 → 2AlBr3, if you have 13.5 g Al and 80.0 g Br2, which is the limiting reactant? (Al = 27, Br = 80)
Context: In the reaction 2H2 + O2 → 2H2O, if you have 3.0 mol H2 and 2.0 mol O2, how many moles of water can be formed?
Context: In the reaction 2K + Cl2 → 2KCl, if you have 10.0 g of K and 10.0 g of Cl2, how many grams of KCl can be formed? (K = 39, Cl = 35.5)
Context: In the reaction 2SO2 + O2 → 2SO3, if you have 8.0 g SO2 and 4.0 g O2, which is the limiting reactant? (S = 32, O = 16)
Define the term 'limiting reactant' in a chemical reaction.
Describe a real-world example where identifying the limiting reactant is important.
Describe how to calculate the amount of excess reactant remaining after a reaction.
Describe the process for determining the limiting reactant in a chemical reaction.
Explain why a reaction stops when the limiting reactant is used up.
Explain why it is important to identify the limiting reactant in a chemical reaction.
Explain why the limiting reactant is not always the reactant present in the smallest mass.
Given the reaction: N2 + 3H2 → 2NH3. If you start with 5 mol N2 and 12 mol H2, which is the limiting reactant?
If 10.0 g of AgNO3 reacts with 5.0 g of NaCl to form AgCl and NaNO3, what mass of AgCl is formed? (Ag = 108, N = 14, O = 16, Na = 23, Cl = 35.5)
If 12.0 g of C reacts with 32.0 g of O2 to form CO2, what is the limiting reactant? (C = 12, O = 16)
