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Worksheets2.2 ATOMIC AND MOLECULAR MASS
Total questions: 10
Worksheet time: 12mins
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.
What is the relative atomic mass of sodium?
a)
11
b)
23
c)
46
d)
64
3.
What is the relative molecular mass of fluorine gas, F2?
a)
19
b)
38
c)
9
d)
18
4.
What is the unit of relative molecular mass?
a)
kilogram
b)
gram
c)
gram per mole (g/mol)
d)
no units
5.
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
6.
Each element is defined by the number of
a)
Atoms
b)
Isotopes
c)
Neutrons
d)
Protons
e)
Nuclei.
7.
What is the relative formula mass of ammonium nitrate, NH4NO3 ?
[Relative atomic mass: N, 14; H, 1; O, 16]
a)
76
b)
79
c)
80
d)
90
8.
Calculate the relative formula mass of
aluminium sulphate, Al2(SO4)3
[Relative atomic mass:
O = 16 ; Al = 27 ; S = 32 ; Cl = 35.5 ; Cu = 64 ]
(a)
9.
The atomic mass of an element is the ___.
a)
average of the mass number and the atomic number for the element
b)
weighted average of the masses of the isotopes of the element
c)
total mass of the isotopes of the element
d)
total number of subatomic particles in the nucleus
10.
What is the relative formula mass of NaOH?
a)
20
b)
39
c)
40
d)
45
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