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WorksheetsMoles
Total questions: 35
Worksheet time: 44mins
Name
Class
Date
1.
How many particles are in a mole?
a)
602
b)
602 million
c)
602 moles
d)
6.02 x 1023
2.
How many atoms of H in 2 moles of CH4?
a)
4
b)
8
c)
4 x 6 x 1023
d)
8 x 6 x 1023
3.
Which conversion factor would you use to calculate correctly the mass of 2 moles of the element titanium?
a)
1 g Ti / 47.84 mol Ti
b)
1 mol Ti / 47.84 g Ti
c)
47.84 mol / 1 g Ti
d)
47.87 g Ti / 1 mol Ti
4.
Which has a greater mass: 1 mole of scandium or 2 moles of boron?
a)
scandium
b)
boron
c)
neither
d)
more information is needed.
5.
Avogadro's number of representative particles is equal to one_____.
a)
kilogram
b)
gram
c)
kelvin
d)
mole
6.
What do we call the SI unit for amount of a substance?
a)
Avogadros number
b)
kilogram
c)
mole
d)
liter
7.
What is the molar mass of Carbon?
a)
6
b)
12
c)
20
d)
40
8.
What does not belong?
a)
particles
b)
atoms
c)
elements
d)
molecules
9.
How many moles of carbon atoms are there in 5g of carbon?
a)
60 mol
b)
17 mol
c)
0.42 mol
d)
7 mol
10.
What is the mass of 54.3x1045molecules of BeO?
a)
3.27x1070 g
b)
9.01 x1022g
c)
2.25 x1024 g
d)
1.31 x1069g
11.
What is the molar mass of carbon dioxide?
a)
44
b)
49
c)
16
d)
20
12.
What is the molar mass of ammonium bromide?
a)
97.943
b)
27.051
c)
28.851
d)
155.367
13.
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
14.
What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?
a)
C3H8
b)
CH4
c)
C2H2
d)
C4H10
15.
What is the empirical formula of the following molecular formula: C3H6
a)
C3H6
b)
CH2
c)
C2H4
d)
CH3
16.
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
17.
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
18.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
19.
C2H6
a)
Empirical
b)
Molecular
20.
Ionic compounds are always expressed as
a)
empirical formula
b)
molecular formula
21.
C6H6
a)
Empirical
b)
Molecular
22.
H2O2
a)
Empirical
b)
Molecular
23.
P4O10
a)
Empirical
b)
Molecular
24.
Al2O3
a)
Empirical
b)
Molecular
25.
C4H10
a)
Empirical
b)
Molecular
26.
N2O5
a)
Empirical
b)
Molecular
27.
C4H10
a)
Empirical
b)
Molecular
28.
CaCl2
a)
Empirical
b)
Molecular
29.
Which of the following numbers can be rounded to 3 when calculating the subscripts of a formula:
a)
2.50
b)
2.59
c)
2.95
d)
3.20
30.
The molar ratio of a compound is found to be 1.5 C for every 2 H
What is the empirical formula of this compound
What is the empirical formula of this compound
a)
C1.5H2
b)
C3H4
c)
C2H
d)
C6H8
31.
What is the % composition of H in heptane, C7H16?
a)
7 %
b)
84 %
c)
70%
d)
16%
32.
How many hours are in a year?
(Hint: 365 days = 1 year)
(Hint: 365 days = 1 year)
a)
8760 hrs
b)
8670 hrs
c)
525,600 hrs
33.
The length of a desk is 3.5 feet. How many centimeters is the length?
(there are 2.54 cm in an inch)
(there are 2.54 cm in an inch)
a)
60 cm
b)
120.23 cm
c)
106.68 cm
d)
117.12 cm
34.
How many dimes equals 14 quarters?
a)
140 dimes
b)
35 dimes
c)
70 dimes
d)
20 dimes
35.
How many yards are in 1 mile?
(Hint: 3 ft = 1 yd and 5280 ft = 1 mi)
(Hint: 3 ft = 1 yd and 5280 ft = 1 mi)
a)
1670 yds
b)
5280 yd
c)
1760 yds
d)
5820 yds
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