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WorksheetsPercent Composition & Formulas
Total questions: 11
Worksheet time: 41mins
Name
Class
Date
1.
What is the empirical formula for the following:
C3H8O
C3H8O
a)
C1.5H4O0.5
b)
C3H8O
c)
C6H16O2
d)
C3H2O
2.
What is the empirical formula for the following:
Pb5Cr5O20
Pb5Cr5O20
a)
Pb2Cr2O10
b)
PbCr2O7
c)
Pb9Cr4O2
d)
PbCrO4
3.
What is the percent composition of Benzene, C6H6?
a)
C = 50%
H = 50%
H = 50%
b)
C = 85.7 %
H = 14.3%
H = 14.3%
c)
C = 92.2%
H = 7.8%
H = 7.8%
d)
C = 71.9%
H = 28.1%
H = 28.1%
4.
What is the percent composition of water?
a)
H = 11.1%
O = 89.9%
O = 89.9%
b)
H = 66.7%
O = 33.3%
O = 33.3%
c)
H = 5.6%
O = 89.9%
O = 89.9%
d)
H = 20%
O = 80%
O = 80%
5.
What is the percent composition of aluminum phosphate?
a)
Al = 25%
P = 25%
O = 75%
P = 25%
O = 75%
b)
Al = 22.1%
P = 35.8%
O = 42.1%
P = 35.8%
O = 42.1%
c)
Al = 14.3%
P = 25.4%
O = 60.3%
P = 25.4%
O = 60.3%
d)
Al = 22.1%
P = 25.4%
O = 52.5%
P = 25.4%
O = 52.5%
6.
Find the empirical formula of a compound that is 72.4% Iron & 27.6% Oxygen.
a)
Fe3O4
b)
FeO
c)
Fe2O3
d)
FeO2
7.
Find the empirical formula for the following:
44.8% C, 7.5% H, & 47.7% O
44.8% C, 7.5% H, & 47.7% O
a)
CH2O
b)
C2H3O2
c)
C3HO3
d)
CH3O
8.
An 8 g sample of a compound is found to be 3.766 g Aluminum & 4.234 g Oxygen. What is it's empirical formula?
a)
Al2O3
b)
AlO2
c)
Al2O
d)
Al3O2
9.
What is the molecular formula of a substance that is 64.3% C, 7.2% H, 28.5% O, with a molar mass of 224.3 g/mol?
a)
C3H4O
b)
C9HO4
c)
C18H8O2
d)
C12H16O4
10.
What is the % Iron from an iron ore sample based on the following data:
Crucible Mass = 126.45 g
Crucible & Ore Mass = 254.82 g
Mass of Metal & Filter = 34.75 g
Mass of Filter = 23.61 g
Crucible Mass = 126.45 g
Crucible & Ore Mass = 254.82 g
Mass of Metal & Filter = 34.75 g
Mass of Filter = 23.61 g
a)
22.41%
b)
8.68%
c)
18.29%
d)
0.377%
11.
What is the % water in a hydrate with the following data:
Mass of Crucible & Hydrate = 34.66 g
Mass of Crucible = 28.45 g
Mass Crucible & Anhydrate = 32.98 g
Mass of Crucible & Hydrate = 34.66 g
Mass of Crucible = 28.45 g
Mass Crucible & Anhydrate = 32.98 g
a)
72.9 %
b)
27.1 %
c)
65.2%
d)
34.8 %
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