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Mole Concepts Review

Total questions: 40

Worksheet time: 2hrs 0mins

Name
Class
Date
1.
How many atoms of iodine are in a mole of iodine?
a)
53
b)
63.55g
c)
126.9
d)
6.02 x 1023
2.
The number 6.02 x 1023 is called...
a)
Obama's number
b)
Bohr's number
c)
Trump's number
d)
Avogadro's number
3.
What is the molar mass of NaCl?
a)
58.45g/mol
b)
28g/mol
c)
12g/mol
d)
6.02 x 1023
4.
We use the periodic table to calculate...
a)
mass
b)
molar mass
c)
moles
5.
Which has more molecules?
a)
1 mole H2O
b)
1 mole Al(OH)3
c)
1 mole NaCl
d)
There are all the same
6.
The molar mass of an element is the mass of one ____ of the element.
a)
atom
b)
molecule
c)
mole
d)
gram
7.
What is the molar mass of one molecule of Nitrogen N2?
a)
14.01 amu
b)
14.01 g
c)
28.02 g
d)
28.02 amu
8.
What is the molar mass of sodium?
a)
11
b)
22.990
c)
45.98
d)
3
9.
What is the mass of one mole of aluminum?
a)
26.982 g
b)
13 g
c)
53.985 g
d)
14 g
10.
What is the molar mass of Carbon?
a)
6
b)
12
c)
20
d)
40
11.
The molar mass of CaCl2:  Formula mass or Molecular mass?
a)
Formula mass, because CaCl2 is Ionic
b)
Molecular Mass, because CaCl2 is Covalent
12.
The molar mass of H2O:  Formula mass or Molecular mass?
a)
Formula mass, because H2O is Ionic
b)
Molecular Mass, because H2O is Covalent
13.
What is the molar mass of CO2?
a)
44.01 g/mol
b)
56.02 g/mol
c)
58.93 g/mol
d)
117.06 g/mol
14.
What are the units for molar mass?
a)
grams
b)
amu
c)
grams/mole
d)
liters
15.
What is the molar mass of MgCl2?
a)
24.31 g/ml
b)
95.21 g/mol
c)
59.76 g/mol
d)
70.90 g/mol
16.

N2 + 3H2 → 2NH3

What is the mole ratio between N2 and NH3 in the above reaction?

a)

1 moles NH3 / 2 moles N2

b)

2 moles NH3 / 1 moles N2

c)

2 moles N2 / 3 moles NH3

d)

1 moles N2 / 3 moles NH3

17.
Which of the following represent a mole ratio between silver nitrate and copper(II) nitrate in the following reaction:
2AgNO3 + Cu --> Cu(NO3)2 + 2Ag
a)
2 mol AgNO3 / 2 mol Ag
b)
2 mol Ag / 2 mol AgNO3 
c)
2 mol AgNO3 / 2 mol Cu(NO3)2
d)
2 mol AgNO3 / 1 mol Cu(NO3)2
18.
4NH3 + 5O2-->4NO + 6H2O
What is the total number of moles of H2O produced when 12 mole of NH3 is completely consumed?
a)
15
b)
18
c)
20
d)
24
19.
6CO2 + 6H2O --> C6H12O6 + 6O2 
What is the total number of moles of water needed to make 2.5 moles of C6H12O6?
a)
2.5
b)
6
c)
12
d)
15
20.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from  6 moles H2? 
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
21.
N2 +  3H2 → 2NH3 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
a)
6
b)
2
c)
3
d)
1
22.
2H2   +   O2  →  2H2O
How many moles of water can be produced if 8 moles H2 are used?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
23.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from  6 moles H2? 
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
24.

Given the reaction: 4Al + 3O2 --> 2Al2O3

How many moles of Aluminum oxide, Al2O3, can you produce if you have 2 moles of Al?

a)

3 mole

b)

2 mole

c)

1 mole

d)

0.5 mole

25.

To convert from moles to particles, you should multiply by ....

a)
b)
c)
d)
26.

5.11 x 1023 atoms of lithium (Li) is equal to how many moles?

a)

1.18 moles

b)

0.351 moles

c)

1.34 moles

d)

0.849 moles

27.

0.75 mole of copper (Cu) is equal to how many atoms?

a)

8.03 x 1023 atoms

b)

6.02 x 1023 atoms

c)

4.51 x 1023 atoms

d)

3.11 x 1023 atoms

28.

To convert from grams to moles, you should multiply by ....

a)
b)
c)
d)
29.

36.0 g of beryllium (Be) contains how many moles?

a)

0.25 mol

b)

4.0 mol

c)

45 mol

d)

320 mol

30.

Find the mass in grams of 2.25 x 1024 atoms of calcium (Ca).

a)

40.0 grams

b)

255.1 grams

c)

150 grams

d)

9.02 x 1024 grams

31.

What is the molar mass of (NH4)3PO4

a)

113.02 g/mol

b)

124.13 g/mol

c)

149.12 g/mol

d)

137.00 g/mol

32.

What is the mass of 6.25 mol of Cu(NO3)2?

a)

126 g

b)

785 g

c)

625 g

d)

1172 g

33.
How many moles are 2.85 x 1018 atoms of iron?
a)
4.73 x 10-6 moles
b)
1.72 x 1042 moles
c)
1.72 x 10-42 moles
d)
4.73 x 106 moles
34.
How many moles are in 15 grams of lithium?
a)
0.5 moles
b)
104.1 moles
c)
2.2 moles
d)
50 moles
35.
What is the mass in grams of 6.25 mol of copper (II) nitrate?
a)
126 g
b)
785 g
c)
625 g
d)
1172 g
36.
How many molecules are in 32.4 grams of phosphorous pentoxide?
a)
1.76 x 1023 molecules
b)
0.29 moles
c)
1.76 x 1022 molecules
d)
0.29 molecules
37.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)  
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
38.
What is the first thing you must do to solve a stoichiometry problem?
a)
Write a Balanced Equation
b)
Panic
c)
Write an Unbalanced Equation
d)
Ask for help
39.

11.

LiOH + KCl → LiCl + KOH

a) I began this reaction with 20 grams of lithium hydroxide. What is my theoretical yield of lithium chloride? *Theo yield is a fancy way of saying "what is my stoich answer".

a)

35.5 grams

b)

11.3 grams

c)

0.03 grams

d)

0.09 grams

40.
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
a)
5.2 g
b)
2.6 g
c)
690 g
d)
45 g

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