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WorksheetsCounting Atoms and Calculating Formula Mass Practice
Total questions: 30
Worksheet time: 24mins
What does the subscript represent?
The number of atoms in a molecule
The number of molecules
The blue numbers in the image below represent ________
element symbol
coefficients
subscripts
yield
The red numbers in the image below represent ________
symbol
coefficients
subscripts
equation
How many Aluminum (Al) atoms are in Al2O3?
How many Sodium (Na) atoms are in 6 NaCl?
How many Hydrogen (H) atoms are in 4 H2O?
How many Magnesium (Mg) atoms are in 10 MgCl2?
How many Oxygen (O) atoms are in 5 O2?
5
10
2
4
How many Chlorine (Cl) atoms are in 7 Cl2?
7
14
2
How many hydrogen (H) atoms are in (NH4)3PO4?
How many atoms of Oxygen (O) are in Fe(NO3)3 ?
three hydrogen (H)
one sulfur (S)
four oxygen (O)
Which is the correct formula for:
two hydrogen (H)
one oxygen (O)
H2O
HO2
H2O2
HO
How many carbon in 2Na₂CO₃?
Number of nitrogen in (NH₄)₂CrO₄?
4 Fe(SO4)2
Fe = 4, S= 4, O= 32
Fe = 1, S = 8, O = 8
Fe= 4, S = 8, S= 32
Fe= 1, S= 4, O = 8
4CF2Cl2
C = 4, F = 4, Cl = 2
C = 1, F = 8, Cl = 8
C = 4, F = 8, Cl = 8
C = 1, F = 4, Cl = 8
A subscript behind a set of parentheses belongs to
the element right before it
all the elements within the parentheses before it
all the elements in the parenthese after it
the element right after it
If there is no subscript, how many atoms of that element are there?
1
2
3
0
How many K are in 5 K2(SO4)3
7
10
30
3
How many S are in5 K2(SO4)3
3
8
15
5
AlN3O9
213
89
41
150.9
What is the mass of LiCl2
20
37
42.5
78
