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WorksheetsIntroduction to Stoichiometry
Total questions: 31
Worksheet time: 2hrs 33mins
Mole ratios are obtained from the
balanced chemical equation
periodic table
molar mass
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
4 moles Fe
6 moles Fe
9 moles Fe
2 moles Fe
In the chemical reaction described by the equation
4Fe(s) + 3O2(g) --> 2Fe2O3(s),
the mole ratio of iron(III) oxide to iron is
1:1
1:2
2:3
4:1
What can be determined from a balanced chemical equation?
Mole ratio of any two substances in the reaction
Energy released in the reaction.
Electron configuration of all elements in the reaction.
Mechanism involved in the reaction.
What is stoichiometry?
The quantitative study of amounts of reactants used and products formed in a chemical reaction.
The study of the speed of reactions by looking at the products formed.
The quantitative study of amounts of products used and reactants formed in a chemical reaction.
The study of types of reactions
The __________ in a balanced equation reveals the mole ratios of the substances involved.
subscript
coefficients
superscript
total number in each compound
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of water can be made from 6 moles H2?
4 moles Fe
6 moles Fe
9 moles Fe
2 moles Fe
In the equation 2 Al2O3 --> 4 Al + 3 O2, what is the mole ratio of aluminum to oxygen (aluminum is asked for, oxygen is given)?
10/6
3/4
4/3
2/3
In the reaction 2 H2 + O2 → 2 H2O what is the mole ratio of oxygen to water
1/2
2/1
3/4
4/3
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
How many moles of water can be produced if 8 moles H2 are used?
What is a mole ratio?
An animal that burrows underground.
How many moles of reactant are used up in a chemical reaction.
The ratio of a reactant / product to a different one - compared by the number of particles.
The process by which we multiply fractions by using numbers from a chemistry problem.
Where are the numbers for a mole ratio found?
They are part of the chemical formulas for the reactants / products.
They are given in the problem.
They are found on the periodic table for those elements.
They are found as coefficients in the reaction's balanced chemical equation.
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
Ethane (C2H6) combusts in the above reaction. What is the mole ratio of ethane to oxygen gas?
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
Ethane (C2H6) combusts in the above reaction. What is the mole ratio of carbon dioxide to water?
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
A problem asks how many moles of oxygen gas are needed to react completely with 6 moles of ethane (C2H6). What is the first step in setting up the problem?
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
New problem: If 16 moles of carbon dioxide are formed by this reaction, how many moles of water were also produced?
4 mol H2O
6 mol H2O
24 mol H2O
96 mol H2O
384 mol H2O
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
New problem: If 3.5 moles of oxygen gas are used up as ethane combusts completely, how many moles of carbon dioxide are produced?
0.5 mol CO2
0.57 mol CO2
2.0 mol CO2
3.0 mol CO2
3.5 mol CO2
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
New problem: How many moles of ethane (C2H6) are required to produce 13.5 moles of water from the above reaction?
4.5 mol C2H6
27 mol C2H6
40.5 mol C2H6
81 mol C2H6
162 mol C2H6
Which mole ratio tells how much aluminum oxide is produced from 3 moles of aluminum?
4Al + 3O2 → 2Al2O3
3 mol Al/ 2 mol Al2O3
2 mol Al2O3/ 4 mol Al
4 mol Al/ 2 mol Al2O3
2 mol Al2O3/ 3 mol Al
What are the missing coefficients for the unbalanced equation below?
Cr(s) + Fe(NO3)2(aq) → Fe(s) + Cr(NO3)3(aq)
2,3,3,2
1,3,3,1
2,3,2,3
2,3,1,2
What are the missing coefficients for the unbalanced equation below?
AlPO4 + Ba(OH)2 → Al(OH)3 + Ba3(PO4)2
1,3,2,3
2,3,2,3
3,2,3,1
2,3,2,1
What is the mole ratio of Ba(OH)2 to AlPO4?
AlPO4 + Ba(OH)2 → Al(OH)3 + Ba3(PO4)2
3 mol Ba(OH)2 / 2 mol AlPO4
1 mol Ba(OH)2/ 1 mol AlPO4
2 mol Ba(OH)2/ 3 mol AlPO4
1 mol Ba(OH)2/ 3 mol AlPO4
What is the mole ratio of Mg to MgCl2?
Mg(s) + HCl(aq) → MgCl2(aq) + H2(g)
2 mol Mg/ 1 mol MgCl2
1 mol Mg/ 2 mol MgCl2
1 mol Mg/ 1 mol MgCl2
2 mol Mg/ 2 mol MgCl2
Mg(s) + HCl(aq) →MgCl2(aq) + H2(g)
The reaction of 2.5 mol of HCl will produce ______ mol of MgCl2.
2.5
1.25
5.0
1.0
If there are 2 moles of oxygen available, which mole ratio will tells how much water is produced?
C3H8 +5O2 → 3CO2 + 4H2O
4 mol H2O/ 5 mol O2
5 mol O2/ 4 mol H2O
2 mol O2/ 4 mol H2O
4 mol O2/ 2 mol H2O
If there are 10 moles of propane, C3H8, which mole ratio will tells how much oxygen is required for the reaction to take place?
C3H8 + 5O2 → 3CO2 + 4H2O
1 mol C3H8/ 5 mol O2
5 mol O2/ 1 mol C3H8
5 mol O2/ 10 mol C3H8
10 mol C3H8/ 5 mol O2
N2 + 3H2 --> 2NH3
How many moles of NH3 is produced from 6 moles of N2?
12 moles
3 moles
2 moles
1.5 moles
