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WorksheetsStoichiometry & % Yield practice
Total questions: 15
Worksheet time: 41mins
What is the first thing you must have to solve a stoichiometry problem?
a Balanced Equation
the amount of product formed
an Unbalanced Equation
the actual amounts of all reactants
What coefficient goes in front of H2?
2H2 + O2 → 2H2O
If 8 moles H2 are reacted with excess oxygen, what is the theoretical yield of water, in moles?
4 moles
8 moles
16 moles
2 moles
How many moles of oxygen are consumed if 8 moles H2 are used?
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the ratio of moles of Mg to moles Fe?
3mol Mg / 2 mol Fe
2 mol Mg/ 3 mol Fe
1 mol Fe/ 2 mol Fe
3 mol MgO / 2 mol Fe
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the ratio of moles of MgO to moles Fe?
3mol Mg / 2 mol Fe
2 mol Mg/ 3 mol Fe
1 mol Fe/ 2 mol Fe
3 mol MgO / 2 mol Fe
2 KClO3 → 2 KCl + 3 O2
How many moles of oxygen can be produced when 6.7 moles of KClO3 decompose completely?
6.7 mol
1.0 mol
10.1 mol
4.5 mol
2Na + 2H2O → 2NaOH+ H2
What is the theoretical yield of hydrogen if 120 g of Na are available?
5.3 g
2.6 g
690 g
45 g
CH4 + 2 O2 → CO2 + 2 H2O
If 5.39 moles of carbon dioxide are produced from the combustion of 110 g of CH4, what is the percent yield?
38.3 %
6.85 %
6.11 %
78.7 %
If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the
theoretical yield
mole ratio
actual yield
percentage yield
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
If 208.2 g grams of aluminum sulfate is formed from the reaction of 250g H2SO4 with excess aluminum, what is the percent yield?
85.0 %
71.5 %
45.0 %
64.2 %
Actual yield = 62g
Calculate the percent yield.
2 Fe2O3 + 3C → 4Fe + 3CO2
You react 28 grams of carbon with sufficient iron (III) oxide and obtain 99.6 grams of CO2. What is the percent yield of CO2?
28.1 %
209.2 %
64.4 %
97.1 %
