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Worksheets

Relative Atomic & Molecular Mass

Total questions: 29

Worksheet time: 5hrs 31mins

Name
Class
Date
1.
What is the relative atomic mass of sodium?
a)
11
b)
23
c)
46
d)
64
2.
What is the relative molecular mass of fluorine gas, F2?
a)
19
b)
38
c)
9
d)
18
3.
What is the relative formula mass of NaOH?
a)
20
b)
39
c)
40
d)
45
4.

Find Atomic Mass: What is the mass of one mole of Lithium (Li)?

a)

6.9 grams

b)

14.0 grams

c)

22.9 grams

d)

56.9 grams

5.

Find Molecular Mass: Calculate the mass of one mole of CO2 (carbon dioxide).

a)

18.0 grams

b)

44.0 grams

c)

14.0 grams

d)

180.0 grams

6.

AgF....

a)

is an element because it has 2 different types of atoms.

b)

is a compound because it has 2 different types of atoms.

c)

is a compound because it has 2 of the same types of atoms.

d)

is an element because it has 2 of the same types of atoms.

7.

How many atoms of NITROGEN are in S(NH4)2 ?

a)

0

b)

1

c)

2

d)

4

8.

How many atoms of HYDROGEN are in S(NH4)2 ?

a)

1

b)

2

c)

4

d)

8

9.

Calculate the molecular mass of PbSO4.

a)

207 amu

b)

32 amu

c)

303 amu

d)

1,020 amu

10.

Calculate the molecular mass of Na3PO4.

a)

164 amu

b)

133 amu

c)

257 amu

d)

170 amu

11.

Calculate the molecular mass of Zn(C2H3O2)2.

a)

185 amu

b)

180 amu

c)

183 amu

d)

179 amu

12.

Calculate the mass of 3SO2.

a)

64 amu

b)

128 amu

c)

192 amu

d)

200 amu

13.

Calculate the mass of 2Cl2F2.

a)

108 amu

b)

89 amu

c)

111 amu

d)

216 amu

14.

Rosie calculated the mass of Mg(OH)2. by adding 24 amu, 16 amu, and 1 amu together.


What would you tell Rosie?

a)

Rosie forgot about the coefficient.

b)

Rosie forgot an element.

c)

Rosie is correct!!

d)

Rosie ignored the subscript outside the parentheses.

15.
The formula of a compound is M(OH)2. Given that the Mr of the compound is 98, calculate the Ar of M.
a)
32
b)
64
c)
81
d)
94
16.

Calculate the relative formula mass of

copper (ii) chloride, CuCl2


[Relative atomic mass:

O = 16 ; Al = 27 ; S = 32 ; Cl = 35.5 ; Cu = 64 ]

(a)  

17.

Insect repellent has the formula of CH3(CH2)5CHCHCHO. Determine the relative molecular mass of this substance.

[Relative atomic mass: H = 1; C = 12; O = 16]

a)

110

b)

120

c)

130

d)

140

18.
The relative atomic mass is the average mass of an atom compared to 
a)
the mass of a carbon-12 atom.
b)
1/12 the mass of a carbon-12 atom
c)
the mass of a hydrogen atom
d)
1/12 the mass of a hydrogen atom
19.
The relative molecular mass of a compound is equal to the sum of its
a)
Atomic mass
b)
Atomic number
c)
Oxidation number
d)
Valence electrons
20.
What is the unit of relative molecular mass?
a)
kilogram
b)
gram
c)
gram per mole (g/mol)
d)
no units
21.

The formula of a compound is M(OH)2. Given that the Mr of the compound is 90, calculate the Ar of M.

a)
32
b)

56

c)

64

d)
94
22.

Find Atomic Mass: What is the mass of one mole of Lithium (Li)?

a)

6.9 grams

b)

14.0 grams

c)

22.9 grams

d)

56.9 grams

23.

Find Molecular Mass: Calculate the mass of one mole of CO2 (carbon dioxide).

a)

18.0 grams

b)

44.0 grams

c)

14.0 grams

d)

180.0 grams

24.

The periodic table displays the mass of how many moles of each element?

a)

1 mole

b)

2 moles

c)

8 moles

d)

it does not tell you the mass of elements

25.

An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?

a)

9.012 Beryllium

b)

12.011 Carbon

c)

6.941 Lithium

d)

10.812 Boron

26.

Find Molecular Mass: Calculate the mass of one mole of CO2 (carbon dioxide).

a)

18.0 grams

b)

44.0 grams

c)

14.0 grams

d)

180.0 grams

27.

The periodic table displays the mass of how many moles of each element?

a)

1 mole

b)

2 moles

c)

8 moles

d)

it does not tell you the mass of elements

28.

The average atomic mass of all of the naturally occurring isotopes of a given element is called ___

a)

the isotope number

b)

stoichiometry

c)

relative atomic mass

d)

the basic atomic mass unit

29.

What is the relative atomic mass of oxygen?

a)

8 amu

b)

16 amu

c)

17 amu

d)

18 amu

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