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WorksheetsEmpirical Formula Chemistry
Total questions: 20
Worksheet time: 1hrs 5mins
Name
Class
Date
1.
An empirical formula is...
a)
the actual formula for covalent compounds.
b)
the simplest whole-number ratio of atoms elements in a compound.
c)
only for ionic compounds.
d)
a description of bonds in a compound.
2.
You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.
a)
SO
b)
SO2
c)
SO3
d)
SO4
3.
What is the empirical formula of the following molecular formula: C3H6
a)
C3H6
b)
CH2
c)
C2H4
d)
CH3
4.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
5.
What is the empirical formula for a compound containing the following ratio:
3Na : 1P : 4O
3Na : 1P : 4O
a)
NaPO4
b)
Na3P4O
c)
Na3PO4
d)
NaPO
6.
A compound came out with the following ratio
3 Carbon: 1.49 Phosphorus: 2 Oxygen- what would be the empirical formula?
3 Carbon: 1.49 Phosphorus: 2 Oxygen- what would be the empirical formula?
a)
Ca6P3O4
b)
C3PO2
c)
C6P3O4
d)
C3P3O2
7.
What is the empirical formula for a compound containing: 92.30% carbon and 7.70% hydrogen
a)
CH
b)
CH4
c)
C2H4
d)
C2H2
8.
What is the empirical formula if you have 88.80% copper and 11.20% oxygen?
a)
Cu3O8
b)
CuO4
c)
Cu2O
d)
Cu4O10
9.
A borane is a compound containing only boron and hydrogen. If a borane is found to contain 88.45% boron, what is its empirical formula?
a)
B2H5
b)
B5H7
c)
B7H5
d)
B3H8
10.
What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?
a)
NO
b)
N2O3
c)
N2O4
d)
N2O5
11.
What do you do when you get a third (.33) in the "divide by small" ratio?
a)
add 3 to each element
b)
multiply only the one with the .33 by 3
c)
multiply all of them by 3
d)
divide them all by 3
12.
Which one is empirical?
a)
H2O2
b)
C2H6O12
c)
CaCl2
d)
N2O8
13.
Which of these can never have a different molecular formula?
a)
C2H6O
b)
CO2
c)
NH3
d)
KClO3
14.
Which pair contains a matching empirical and molecular formula pair?
a)
C2H4, C6H8
b)
CH, CH2
c)
C3H6O, C6H12O2
d)
C16H24O8, C4H6O2
15.
What is the molecular formula if the empirical formula is C2H5 and the molecular molar mass is 58.14 g/mol?
a)
C2H5
b)
C4H10
c)
C1H2.5
d)
C4H8
16.
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
a)
CH2O
b)
C2H4O2
c)
C4H8O4
d)
C6H12O6
17.
T/F
If 2 compounds have the same empirical formula, they have similar chemical and physical properties.
If 2 compounds have the same empirical formula, they have similar chemical and physical properties.
a)
True
b)
False
18.
Find the percent composition of N2S2.
a)
N: 69.6% S: 30.4%
b)
N:36% S: 75.6%
c)
N: 96.6% S: 3.4%
d)
N: 30.4% S: 69.6%
19.
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%
20.
What is the molecular formula of a compound with an empirical formula of C2OH4 and a molar mass of 88 grams per mole?
a)
C2O4H8
b)
C8O2H4
c)
C4O2H8
d)
C4O8H2
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