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WorksheetsPercent Comp, Empirical vs Molecular Formulas Review
Total questions: 15
Worksheet time: 1hrs 15mins
Name
Class
Date
1.
What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?
a)
29%
b)
43%
c)
57%
d)
73%
2.
What percentage of the total atomic mass of carbon monoxide (CO) is composed of oxygen?
a)
29%
b)
43%
c)
57%
d)
73%
3.
What percentage of the total atomic mass of magnesium bromide (MgBr2) is composed of magnesium?
a)
13%
b)
43%
c)
63%
d)
87%
4.
What percentage of the total atomic mass of magnesium bromide (MgBr2) is composed of bromine? Hint - consider the mass of both atoms of bromine in your calculation.
a)
13%
b)
43%
c)
63%
d)
87%
5.
What is the percent by mass of sodium in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
6.
Which of the following is considered an empirical formula?
a)
CH3COOH
b)
C6H12O6
c)
H2O
7.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
8.
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
9.
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
10.
What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.
a)
K2SO4
b)
K8SO16
c)
K8S4O8
d)
K8S4O16
11.
What is the empirical formula of C4H6 ?
a)
CH
b)
CH3
c)
C2H3
d)
C4H6
12.
A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________
a)
ionic formula
b)
covalent formula
c)
empirical formula
d)
molecular formula
13.
Which one is an empirical formula?
a)
H2O2
b)
C2H6O12
c)
CaCl2
d)
N2O8
14.
Which of the following could be a molecular formula with the empirical formula of CH2O?
a)
CH2O2
b)
CHO
c)
C3H5O3
d)
C2H4O2
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
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