Middlesex Community College Chemical Reactions Worksheet

Author:

March 31st, 2023

Stoichiometry Practice QuizAnswer Key
1. What is the molar mass for each reactant and product?
a.
FeCl3
b. BaSO4
1 x Fe = 1 x 56
= 56
3 x Cl = 3 x 35.5 = 106.5
1 x Ba = 1 x 137
1 x S = 1 x 32
4 x O = 4 x 16
162.5 g FeCl3
1 mol FeCl3
c.
= 137
= 32
= 64
233 g BaSO4
1 mol BaSO4
Fe2(SO4)3
d. BaCl2
2 x Fe = 2 x 56
= 112
3 x S = 3 x 32
= 96
12 x O = 12 x 16 = 192
1 x Ba = 1 x 137 = 137
2 x Cl = 2 x 35.5 = 71
400 g Fe2(SO4)3
1 mol Fe2(SO4)3
208 g BaCl2
1 mol BaCl2
2. Balance the equation.
2 FeCl3
+
3
à
BaSO4
1 Fe2(SO4)3
+
3 BaCl2
3. How many moles of Fe2(SO4)3 are produced when 0.0045 mol of BaCl2 are produced?
1 mol Fe2(SO4)3
3 mol BaCl2
ratio
from
chemical
equation
x
0.0045 mol BaCl2
1
=
0.0015 mol Fe2(SO4)3
4. How many moles of Fe2(SO4)3 will be produced when 145 g of BaSO4 react?
1 mol Fe2(SO 4)3
1 mol BaSO4
x
3 mol BaSO4
233 g BaSO4
ratio
from
chemical
equation
145 g BaSO4
x
1
= 0.207 mol Fe2(SO 4)3
given
molar
mass
BaSO4
5. How many grams of Fe2(SO4)3 are produced when 5.6 moles of BaCl2 are produced?
400 g Fe2(SO 4)3
x
1 mol Fe2(SO 4)3
1 mol Fe2(SO 4)3
3 mol BaCl2
5.6 mol BaCl2
x
ratio
from
chemical
equation
molar
mass
Fe2(SO 4)3
= 750 g Fe2(SO 4)3
1
given
6. How many moles of FeCl3 are in 67 grams of FeCl3?
1 mol FeCl3
162.5 g FeCl3
x
67 g FeCl3
=
0.41 mol FeCl3
1
molar
mass
FeCl3
given
7. If 4.6 grams of FeCl3 are used, how many moles of BaSO4 are needed?
3 mol BaSO4
x
2 mol FeCl3
ratio
from
chemical
equation
1 mol FeCl3
162.5 g FeCl3
molar
mass
FeCl3
x
4.6 g FeCl3
1
=
0.042 mol BaSO4
given
8. In this reaction, which element is oxidized and which is reduced?
+
Cr
à
Cr2O3
+
Zn
Zn2+ O2- +
Cro
à
Cr3+ O2-
+
Zno
Zn2+
Cro
à
Cr3+ +
Zno
(remove O2- from both sides)
Zn2+
à
Zno
(gain electrons reduction)
Cro
à
Cr3+
(lose electrons oxidation)
ZnO
+
2
Name ____________________________________
Reactions Quiz
1. What is the molar mass for each reactant and product?
a.
NaCl
b. Al2(SO4)3
c.
Na2SO4
d. AlCl3
2. Balance the equation.
NaCl
+
Al2(SO4)3
à
Na2SO4
+
AlCl3
3. When 117 g of AlCl3 are produced, how many grams of Na2SO4 are needed?
4. When 6.3 g of Al2(SO4)3 react, how many moles of Na2SO4 will be produced?
5. When 4.8 moles of AlCl3 are produced, how many grams of Na2SO4 are produced?
6. How many moles of NaCl are in 250 grams of NaCl?
7a.
In this reaction, which element is oxidized and which is reduced?
7b.
What type of reaction is this?
FeO
+
SnCl4
à
FeCl3
+
SnO
page 2

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Middlesex Community College Chemical Reactions Worksheet

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