"Unit 08 - Stoichiometry - Worksheet 1 With Answer Key"

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Name Answer Key
Date
Unit 08 – Stoichiometry – Worksheet 1
Answer the following questions in the space provided at the left.
__18 mol O
_____ 1.
How many moles of oxygen are produced from twelve moles
2
of Potassium chlorate?
2KCLO
2KCl +
3O
3
2
12 mol
x mol
12 mol KClO
3 mol O
3
2
2 mol KClO
3
_21 mol O
_
2.
How many moles of oxygen are produced from 14 moles of
2
Potassium chlorate?
2KCLO
2KCl +
3O
3
2
14 mol
x mol
14 mol KClO
3 mol O
3
2
2 mol KClO
3
__45 mol H
O___ 3.
How many moles of water are produced from 22.5 moles of
2
oxygen?
2H
+
O
2H
O
2
2
2
22.5 mol
x mol
22.5 mol O
2 mol H
O
2
2
1 mol O
2
_20 mol HCl__
4.
Calculate the number of moles of Hydrogen chloride
produced from 10 moles of hydrogen.
H
+
Cl
2HCl
2
2
10 mol
x mol
10 mol H
2 mol HCl
2
1 mol H
2
_21 mol Cl
5.
Calculate the number of moles of chlorine needed to form 14
2
moles of Iron (III) chloride.
2Fe
+
3Cl
2FeCl
2
3
x mol
14 mol
14 mol FeCl
3 mol Cl
3
2
2 mol FeCl
3
Name Answer Key
Date
Unit 08 – Stoichiometry – Worksheet 1
Answer the following questions in the space provided at the left.
__18 mol O
_____ 1.
How many moles of oxygen are produced from twelve moles
2
of Potassium chlorate?
2KCLO
2KCl +
3O
3
2
12 mol
x mol
12 mol KClO
3 mol O
3
2
2 mol KClO
3
_21 mol O
_
2.
How many moles of oxygen are produced from 14 moles of
2
Potassium chlorate?
2KCLO
2KCl +
3O
3
2
14 mol
x mol
14 mol KClO
3 mol O
3
2
2 mol KClO
3
__45 mol H
O___ 3.
How many moles of water are produced from 22.5 moles of
2
oxygen?
2H
+
O
2H
O
2
2
2
22.5 mol
x mol
22.5 mol O
2 mol H
O
2
2
1 mol O
2
_20 mol HCl__
4.
Calculate the number of moles of Hydrogen chloride
produced from 10 moles of hydrogen.
H
+
Cl
2HCl
2
2
10 mol
x mol
10 mol H
2 mol HCl
2
1 mol H
2
_21 mol Cl
5.
Calculate the number of moles of chlorine needed to form 14
2
moles of Iron (III) chloride.
2Fe
+
3Cl
2FeCl
2
3
x mol
14 mol
14 mol FeCl
3 mol Cl
3
2
2 mol FeCl
3
Name
2
_184 g NO
___
6.
Calculate the number of grams of Nitrogen dioxide that are
2
produced from 4 moles of Nitric oxide.
2NO +
O
2NO
2
2
? g
4 mol
mol
4 mol NO
2 mol NO
46 g NO
2
2
2 mol NO
1 mol NO
2
__29.4 g O
___
7.
Calculate the mass of oxygen produced from the
2
decomposition of 75.0 g of Potassium chlorate.
2KClO
2KCl +
3O
3
2
75.0 g
? g
mol
mol
75.0 g KClO
1 mol KClO
3 mol O
32 g O
3
3
2
2
122.5 g KClO
2 mol KClO
1 mol O
3
3
2
_63.2 g Ag___
8.
Calculate the mass of silver needed to react with chlorine to
produce 84 g of Silver chloride. (Hint: write a balanced
equation first.)
2 Ag +
Cl
2 AgCl
2
? g
84 g
mol
mol
84g AgCl
1 mol AgCl
2 mol Ag
108 g Ag
143.5 g AgCl
2 mol AgCl
1 mol Ag
_6.72 L CO
__
9.
How many liters of Carbon monoxide at STP are needed to
2
react with 4.80 g of oxygen gas to produce carbon dioxide?
2CO +
O
2CO
2
2
? L
4.80 g
mol
mol
4.80 g O
1 mol O
2 mol CO
22.4 L CO
2
2
2
2
32 g O
1 mol O
1 mol CO
2
2
2
Name Answer Key
3
_22.5 L O
_
10.
Calculate the number of liters of oxygen gas needed to
2
produce 15.0 liters of Dinitrogen trioxide.
2N
+
3O
2N
O
2
2
2
3
? L
15.0 L
mol
mol
15.0 L N
O
1 mol N
O
3 mol O
22.4 L O
2
3
2
3
2
2
22.4 L N
O
2 mol N
O
1 mol O
2
3
2
3
2
Write the correct answer for each of the following statements or questions in the
blank provided. Use your book, if necessary, to find the terms that fit the
definitions.
23
Avogadro’s number?
6.02 X 10
11.
Stoichiometry
12.
the calculations of quantities in chemical reactions.
Product
13.
a substance formed in a chemical reaction.
Coefficient
14.
a number showing the relative number of moles involved in a
reaction.
Reactants
15.
the starting materials in an equation.
Mass-mass
Calculations
16.
determining the mass of products from the given mass of
reactants.
Multiple Choice
__B___17.
Which of these expressions is an incorrect interpretation of the balanced
equation?
2S
+
3O
2SO
2
3
A.
2 atoms S + 3 molecules O
2 molecules SO
2
3
B.
2 g S + 3 g O
2 g SO
2
3
C.
2 mole S + 3 mole O
2 mole SO
2
3
D.
none of the above
__C___18.
In a chemical reaction, the mass of the products:
A.
is less than the mass of the reactants.
B.
Is greater than the mass of the reactants.
C.
Is equal to the mass of the reactants.
D.
Has no relationship to the mass of the reactants.
__B___19.
How many liters of oxygen are required to react completely with 1.2 liters
 2H
of hydrogen to form water?
2H
+ O
O
2
2
2
A. 1.2 L
B. 0.6 L
C. 2.4 L
D. 4.8 L
 at STP are produced when 68.0 g of CaCO
__B___20.
How many liters of CO
is
2
3
heated according to the equation:
CaCO
CaO +
CO
3
2
A. 0.679 L
B. 15.2 L
C. 68.0 L
D. 30.4 L