Chemistry: Limiting and Excess Reagents & Percent Yield
Part A:
1. Hydrogen gas can be produced by the reaction of magnesium metal and hydrochloric acid. Write a
balanced chemical equation for this reaction and identify the limiting and excess reagents when 6.00g
hydrochloric acid reacts with 5.00g magnesium.
2. Dicarbon tetrahydride undergoes incomplete combustion (CO is a product instead of CO2). If 2.70 mol
of dicarbon tetrahydride reacted with 6.30 mol of oxygen gas, identify the limiting reagent.
3. 116.90 grams of aqueous potassium carbonate reacts with 2.01 moles of aqueous barium hydroxide.
Find the limiting reagent.
4. Aluminum metal reacts with chlorine gas. Identify the limiting reagent if 3.0 mol aluminum reacted with
5.3 mol chlorine gas.
5. ___ Sb2S3(s) + ___ Fe(s)  ___ Sb (s) + ___ FeS(s)
If 15.0 g of Sb2S3 reacts with 19.9 g iron, identify the limiting reactant.
Part B:
For all of the problems in Part A, identify how much of the excess reactant would be leftover.
Part C: % Yield
For all of the problems in Part A, identify the percent yield given the actual/experimental values below:
1.
2.
3.
4.
5.
0.153 g H2
124 g CO
63.900 g KOH
370 g AlCl3
11.4 g FeS