Stoichiometry
Percent Yield
Limiting Reactant
Definitions
100
How many moles of KCl form if 3.4 moles of KClO3 are totally consumed?
2 KClO3 --> 2 KCl + 3O2
3.4 mol KCl
100
Calculate the percent yield if the theoretical yield is 50.0 g of a product and the actual yield is 42.0 g.
84.0 %
100
If 3.4 mol of ZnS are heated in presence of 4.3 mol of O2, which reactant will be used up first?
2 ZnS + 3 O2 --> 2 ZnO + 2 SO3
O2
100
What is the quantitative study of amounts of reactants used and products formed in a chemical reaction?
Stoichiometry
200
What mass of tetraphosphorus decoxide will be produced with 4.15 mol of oxygen?
4P + 5O2 --> P4O10
235.62 g P4O10
200
If the actual yield of a compound is 0.198 g and the theoretical yield is 0.217 g, find the percent yield.
91.24%
200
Which reactant is limiting if 0.47 mol Al and 0. 50 mol O2 are available?
4 Al + 3O2 --> 2 Al2O3
Al
200
What is a conversion factor that relates the amounts in moles of any two substances involved in a chemical reaction?
Mole ratio
300
How many moles of NaNO3 are produced with 150.0 g of Na2CO3?
Na2CO3 + 2 HNO3 --> 2 NaNO3 + CO2 + H2O
2.83 mol NaNO3
300
What is the percent yield of the following reaction if 60 grams of CaCO3 is heated to give 15 grams of CaO?
CaCO3→CaO + CO2
44.6 %
300
Take the reaction:
4 NH3 + 5 O2 → 4 NO + 6 H2O.
In an experiment, 3.25 g of NH3 are allowed to react with 3.50 g of O2. Which reactant is the limiting reagent?
O2
300
What is percentage yield?
The percentage yield is the ratio of the actual yield to the theoretical yield
400
How many grams of H2 are produced if 45 g of water react with excess sodium?
2 Na + 2 H2O --> 2 NaOH + H2
2.52 g H2
400
If the reaction of 6.5 grams of C6H12O6 produces 2.5 grams of CO2, what is the percent yield?
78.9 %
400
If 4.95 g of ethylene (C2H4) are combusted with 3.25 g of oxygen. How many grams of CO2 are formed?
C2H4 + 3 O2 → 2 CO2 + 2 H2O
2.99 g CO2
400
What is the limiting reactant?
The limiting reactant is the reactant that limits the amount of the other reactant that can combine and the amount of product that can form in a chemical reaction.
500
What mass of oxygen gas is produced if 134 g of lithium perchlorate decomposes according to the following equation?
LiClO4 --> LiCl + 2 O2
80.61 g O2
500
In a certain experiment, 40.0g KClO3 is heated until it completely decomposes. What is the theoretical yield of oxygen gas? The experiment is performed, the oxygen gas is collected, and its mass is found to be 14.9g. What is the percent yield for the reaction?
2KClO3→2KCl+3O2
95.1 %
500
Consider the reaction of C6H6 + Br2 --> C6H5Br + HBr
What is the theoretical yield of C6H5Br if 42.1 g of C6H6 react with 73.0 g of Br2?
72.2 g C6H5Br
500
What is the maximum amount of product that can be produced from a given amount of reactant?
Theoretical yield