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molar mass

Total questions: 60

Worksheet time: 2hrs 23mins

Name
Class
Date
1.
The molar mass of an element is equal to its...
a)
Atomic mass
b)
Atomic number
c)
Oxidation number
d)
Valence electrons
2.
What is the molar mass of sodium?
a)
11
b)
23
c)
45.98
d)
3
3.
What is the molar mass of CO2?
a)
12
b)
16
c)
32
d)
44
4.
How many particles are in a mole?
a)
602
b)
602 million
c)
602 moles
d)
6.02 x 1023
5.

What is the molar mass of Cl2?

a)

17 g/mol

b)

35.5 g/mo;

c)

71.0 g/mol

d)

89 g/mol

6.

What id the molar mass of UF6?

a)

101 g/mol

b)

238 g/mol

c)

257 g/mol

d)

352 g/mol

7.

Calculate the molar mass of Ba(C2H3O2)2

a)

255.3 g/mol

b)

237.3 g/mol

c)

228.3 g/mol

d)

196.3 g/mol

8.

Calculate the molar mass of Cu2O.

a)

37 g/mol

b)

45 g/mol

c)

79.5 g/mol

d)

143 g/mol

9.

Calculate the molar mass of water (H2O).

a)

10 g/mol

b)

17 g/mol

c)

18 g/mol

d)

34 g/mol

10.

Calculate the molar mass of NH4NO2

a)

50 g/mol

b)

60 g/mol

c)

64 g/mol

d)

78 g/mol

11.
What is the molar mass of AuCl3?
a)
96 g
b)
130 g
c)
232.5 g
d)
303.3 g
12.
What is the definition for Avogadro's number?
a)
number of grams per one mole of a substance
b)
whole number ratio that is a multiple of a chemical formula
c)
simplest, whole number ratio of a chemical formula
d)
6.02 x 10^23 particles per one mole of a substance
13.
What is the mass in grams of 5.90 mol C8H18?
a)
.0512 g
b)
19.4 g
c)
673 g
d)
389 g
14.

Calculate the molar mass of Ba(C2H3O2)2

a)

255.3 g/mol

b)

237.3 g/mol

c)

228.3 g/mol

d)

196.3 g/mol

15.

Calculate the molar mass for Al(OH)3

a)

78.0 g/mol

b)

72 g/mol

c)

28 g/mol

d)

25 g/mol

16.

Calculate the molar mass of NH4NO2

a)

50 g/mol

b)

60 g/mol

c)

64 g/mol

d)

78 g/mol

17.
What is the molar mass of AuCl3?
a)
96 g
b)
130 g
c)
232.5 g
d)
303.3 g
18.

What is the atomic number of Cl

a)

35.5

b)

17

c)

6

d)

Cl

19.

How many particles are in a mole?

a)

602

b)

602 million

c)

602 moles

d)

6.022 x 1023

20.

What element has an atomic mass of 1.01?

a)

Hydrogen

b)

Helium

c)

Carbon

d)

Gold

21.

Find the mass of 3.5 mols of NiCl2

a)

558.6 g/mol

b)

558.6 g

c)

37.02 g/mol

d)

37.02 g

22.

What is the mass of .072 mols of FeCl3?

a)

162.3 g

b)

11.7 mols

c)

11.7 g

d)

11.7 g/mol

23.

How many moles are in 2.35 g H2O?

a)

0.13 mols

b)

13 mols

c)

1.3 mols

d)

130 mols

24.

What is the mass of .46 mols MgCl2?

a)

4.4 g

b)

440 g

c)

.44 g

d)

44 g

25.

How many moles are in 106.3 g of Copper, Cu?

a)

167 mols

b)

1.673 mols

c)

16.73 mols

d)

.167 mols

26.

How many moles are in 1.0g of NaCl ?

a)

0.181 mole

b)

6.0 x 1023 mole

c)

0.50 mole

d)

0.017 mole

27.

How many moles are in 225g of CO?

a)

8.03 mole

b)

28.01 mole

c)

4.82x1024 mole

d)

7.50 mole

28.
What is the molar mass of NaOH?
a)
40 g/mol
b)
38.989 g/mol
c)
23.998 g/mol
d)
57.004 g/mol
29.
How many grams are in 2.4mol of sulfur?
a)
0.075g
b)
77g
c)
6.2x102g
30.
How many moles are in 98.3 g of aluminium hydroxide?
a)
0.794 mol
b)
1.26 mol
c)
2.23 mol
d)
7.67x103 mol
31.
Which conversion factor should be used to solve the following, "How many moles in 28 grams of CO2?"
a)
1 mol = 22.4 L 
b)
1 mol = 44.01 g
c)
1 mol = 6.02x1023 atoms
d)
more than one
32.
How many moles are there in 440g of carbon dioxide molecules?
a)
11
b)
10
c)
16
d)
0.25
33.
How many atoms are in 1 mole of NaCl? 
a)
6.02 x 1023
b)
58 
c)
11
d)
17
34.
What is the mass of one mole of AuCl3?
a)
96g
b)
130g
c)
232.5g
d)
303.5g
35.
What is the mass of one mole of (NH4)2CO3?
a)
144g
b)
138g
c)
96g
d)
74g
36.
36.0 g of Be contains how many moles?
a)
0.25 mol
b)
4.0 mol
c)
45 mol
d)
320 mol
37.
4.0 moles of H2O would have what mass?
a)
72 g
b)
23 g
c)
68 g
d)
4.5 g
38.
How many grams are in 0.02 moles of beryllium iodide, BeI2?
a)
13,150 g
b)
0.0007 g
c)
5.3 g
d)
50 g
39.
How many moles are in 68 grams of copper (II) hydroxide, Cu(OH)2?
a)
1.4 moles
b)
0.7 moles
c)
6,630 moles
d)
50 moles
40.
How many moles are present in a 32.5 sample of aluminum chloride?
a)
720 moles
b)
1.2 moles
c)
0.2 moles
d)
0.5 moles
41.
Which sample of O2 contains a total of 3 x 1023 molecules?
a)
1.0 moles
b)
2.0 moles
c)
16.0 grams
d)
32.0 grams
42.
The total number of molecules in 34.0 grams of NH3 is equal to 
a)
1.00 x 22.4
b)
2.00 x 22.4
c)
1.00 (6.02 x 1023)
d)
2.00 (6.02 x 1023)
43.
How many molecules are in 3.6 grams of NaCl?
a)
0.06
b)
1.0x1021
c)
1.3x1026
d)
3.7x1022
44.
How many atoms are in a 3.56 g sample of Cu?
a)
3.37 x 1022 Cu atoms
b)
6.02 x 1023 Cu atoms
c)
0.056 Cu atoms
d)
1 Cu atom
45.
You have 8.65 x 1025 atoms arsenic. How many grams do you have?
a)
144 g As
b)
10,765 g As
c)
107 g As
d)
None of these
46.
How many moles are in 3.01 x 1022 atoms of magnesium?
a)
0.050 moles
b)
1.81 x 1046 moles
c)
5.00 x 1021 moles
d)
5.00 moles
47.
Balance this equation:
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
48.
Balance this equation:
 2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
49.
How many Hydrogen (H) atoms are in NH3O5
a)
3
b)
4
c)
5
d)
1
50.
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
a)
1
b)
2
c)
3
d)
0
51.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
52.
Balance this equation...
HgO --> 2Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
53.
Balance this equation...
Sb2S3 + O2 --> Sb + SO2
a)
It is balanced
b)
Sb2S3 + 3O2 --> 2Sb + 3SO2
c)
Sb2S3 + O2 --> 2Sb + SO2
d)
I don't know...Oh well!
54.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Na + __H2O --> __NaOH + __H2
a)
2,2 --> 2,1
b)
4,4 --> 4,1
c)
1,2 --> 2,4
d)
1,2 --> 2,1
55.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe2O3--> __Fe + __CO2
a)
3,1 --> 2,3
b)
3,2 --> 1,1
c)
3,2 --> 2,4
d)
3,2 --> 2,1
56.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CH4 + __O2 --> __CO2+ __H2O
a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
57.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__AgNO3 + __H2S --> __Ag2S+ __HNO3
a)
2,1 --> 1,2
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
58.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Al + __O2--> __Al2O3
a)
4,1 --> 2
b)
4,3 --> 4
c)
3,4 --> 1
d)
4,3 --> 2
59.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__MnO2 + __HCl --> __MnCl2 + __H2O __Cl2
a)
4,1 --> 2,1,2
b)
1,2 --> 1,1,4
c)
1,4 --> 1,2,1
d)
1,4 --> 2,2,1
60.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__FeCl3 + __Ca(OH)2 --> __Fe(OH)3 + __CaCl2
a)
4,3--> 2,1
b)
3,2 --> 3,1
c)
2,3 --> 2,2
d)
2,3 --> 2,3

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