WorksheetsChapter 10 Review
Total questions: 17
Worksheet time: 29mins
Name
Class
Date
1.
The mass of one mole of an element is equal to
a)
its atomic number from the periodic table, but in amus.
b)
its atomic mass from the periodic table, but in amus.
c)
its atomic mass from the periodic table, but in grams.
d)
its atomic number from the periodic table, but in grams.
2.
Determine the mass of 4.20 moles of C6H12
a)
353 g
b)
0.0499 g
c)
337 g
d)
2.53 x 1024 g
3.
How many molecules are there in 31.8 moles of water?
a)
5.28 x 10-23 molecules
b)
1.91 x 1025 molecules
c)
5.28x 10-25
d)
1.91 x 1022
4.
What is the mass of 1.2 x 1024 atoms of C?
a)
2.0 grams
b)
24 grams
c)
0.17 grams
d)
1.4 x 1025 grams
5.
What is the percent by mass of magnesium in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
6.
What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
49%
d)
65%
7.
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
8.
Which of the following is considered an empirical formula?
a)
CH3COOH
b)
C6H12O6
c)
H2O
9.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
10.
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
11.
What is the best statement for the picture.
a)
The molecule has two carbon atoms and four hydrogen molecules.
b)
The molecule has two carbon atoms and four hydrogen atoms.
c)
The molecule has two carbon atoms.
12.
EF = CF2
Molecular formula mass = 192
MF =
Molecular formula mass = 192
MF =
a)
C4F8
b)
C4F
c)
CF8
d)
C2F4
13.
Which of the following represents an empirical formula?
a)
H2O2
b)
HC2O4
c)
H2O6
d)
H12O48
14.
Which conversion factor should be used to solve the following, "How many moles of argon atoms are present in 11.2 L of argon gas at STP?"
a)
1 mol = 22.4 L
b)
1 mol = 39.95 g
c)
1 mol = 6.02x1023 atoms
d)
More than 1
15.
A container with a volume of 893 L contains how many moles of air at STP?
a)
20003.2 L
b)
39.9 L
c)
22.4 L
d)
none of the choices
16.
How many moles are in a 18 L tank of nitrogen gas?
a)
0.9 moles
b)
1 mole
c)
0.8 moles
d)
0.75 moles
17.
What is the volume of 2 moles of helium gas?
a)
22.4 L
b)
44.8 L
c)
67.2 L
d)
89.6 L
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