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Worksheets%C, EF, and MF Practice
Total questions: 16
Worksheet time: 4hrs 33mins
Name
Class
Date
1.
What is the percent by mass of chlorine in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
2.
What percent of Zn3(PO4)2 is zinc?
a)
33.15%
b)
16.04%
c)
50.80%
d)
19.68%
3.
Find the percent composition of CaCl2?
a)
Ca: 36.11%; Cl: 63.88%
b)
Ca: 53.12%; Cl: 100%
c)
Ca: 36.11%; Cl: 83.56%
d)
Ca: 46.11%; Cl: 63.88%
4.
What is the percent composition of S in the formula (NH4)2S ?
a)
12.05%
b)
19.30%
c)
47.11%
d)
56.18%
5.
An empirical formula:
a)
is a formula that calculates the coefficients of a compound in a balanced equation.
b)
is the simplest whole-number ratio of moles of elements in the compound.
6.
What is the empirical formula of the following molecular formula: C3H6
a)
C3H6
b)
CH2
c)
C2H4
d)
CH3
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.
Which one is an empirical formula?
a)
H2O2
b)
C2H6O12
c)
CaCl2
d)
N2O8
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.
What is the symbol of the element: gold?
a)
Ag
b)
As
c)
Ap
d)
Au
11.
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
12.
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
13.
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
14.
How many Carbons "C" are in C18H34O3
a)
18
b)
34
c)
3
d)
37
15.
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
16.
What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?
a)
NO
b)
N2O4
c)
N2O3
d)
N2O5
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