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WorksheetsEmpirical formula
Total questions: 12
Worksheet time: 14mins
Name
Class
Date
1.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2
d)
MgN
2.
Which of the following is considered an empirical formula?
a)
CH3COOH
b)
C6H12O6
c)
H2O
3.
What is the empirical formula for C4H6?
a)
CH
b)
CH3
c)
C2H3
d)
C4H6
4.
A formula with the lowest whole # ratio of elements in a compound is called
a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula
d)
Distance Formula
5.
What is the empirical formula for N2S3?
a)
NS
b)
N3S2
c)
N2S3
d)
N1S1.5
6.
Si2F6
Choose the correct empirical formula...
a)
SiF
b)
Si2F6
c)
SiF3
d)
Si6F2
7.
C2F6
Choose the correct empirical formula...
a)
CF
b)
C2F6
c)
C6F2
d)
CF3
8.
What is the best definition for coefficient?
a)
The big number that tells you the number of molecules.
b)
The little number that tells the number of atoms for each element.
c)
The atomic number
9.
What is the best definition for subscript?
a)
The big number that tells you the number of molecules.
b)
The atomic number
c)
The little number that tells the number of atoms for each element.
10.
C2H6O
Which is the correct empirical formula
a)
CHO
b)
C2H6O
c)
C4H14O2
d)
None
11.
What is the percent composition by mass of oxygen in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
12.
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
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