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WorksheetsUnit 5: Counting Atoms
Total questions: 15
Worksheet time: 9mins
Name
Class
Date
1.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
2.
How many atoms of Al are in Al₂(SO₄)₃
a)
1
b)
2
c)
8
d)
12
3.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
4.
The number of Na's in Na₂CO₃
a)
1
b)
2
c)
3
d)
6
5.
Number of C's in Na₂CO₃
a)
1
b)
2
c)
3
d)
5
6.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
7.
Number of total atoms in Na₂CO₃
a)
2
b)
4
c)
5
d)
6
8.
Number of O atoms in Na₂CO₃
a)
1
b)
3
c)
5
d)
6
9.
Number of H atoms in (NH₄)₂Cr₂O₇
a)
4
b)
6
c)
8
d)
56
10.
Number of Cr atoms in (NH₄)₂Cr₂O₇
a)
2
b)
6
c)
8
d)
56
11.
Number of O atoms in (NH₄)₂Cr₂O₇
a)
2
b)
6
c)
7
d)
56
12.
Number of Cr atoms in Al₂(Cr₂O₇)₃
a)
2
b)
5
c)
6
d)
9
13.
Number of Al atoms in Al₂(Cr₂O₇)₃
a)
1
b)
2
c)
6
d)
18
14.
Number of O atoms in Al₂(Cr₂O₇)₃
a)
7
b)
10
c)
21
d)
42
15.
Number of C's in CO
a)
1
b)
2
c)
3
d)
4
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