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WorksheetsMr and Ar
Total questions: 15
Worksheet time: 30mins
Name
Class
Date
1.
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
2.
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
3.
What is the relative atomic mass of sodium?
a)
11
b)
23
c)
46
d)
64
4.
What is the relative molecular mass of fluorine gas, F2?
a)
19
b)
38
c)
9
d)
18
5.
What is the relative formula mass of NaOH?
a)
20
b)
39
c)
40
d)
45
6.
What is the relative molecular mass of CO2?
a)
12
b)
16
c)
32
d)
44
7.
What is the relative atomic mass of sodium?
a)
11
b)
23
c)
46
d)
64
8.
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
9.
How many atoms of NITROGEN are in S(NH4)2 ?
a)
0
b)
1
c)
2
d)
4
10.
Calculate the Mr of PbSO4.
a)
207 amu
b)
32 amu
c)
303 amu
d)
1,020 amu
11.
What is Mr of K2O?
a)
27
b)
35
c)
94
d)
110
12.
What is Mr of Mg(OH)2?
a)
19
b)
26
c)
42
d)
58
13.
What is the method to calculate Relative Molecular Mass?
a)
Add the atomic masses of all atoms in a molecule
b)
Multiply the atomic mass of each element by the number of atoms in the molecule and then add them up
c)
Divide the atomic mass of each element by the number of atoms in the molecule and then add them up
d)
Subtract the atomic masses of all atoms in a molecule
14.
What is the unit for molar mass?
a)
no unit
b)
g
c)
g mol-1
15.
Calculate the number of gold atoms in a 4 mole sample of gold.
a)
2.41x1024
b)
3.01x1023
c)
4.82x1024
d)
6.02x1023
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