WorksheetsThe Mole
Total questions: 35
Worksheet time: 3hrs 54mins
Name
Class
Date
1.
What is Avogadro's Number?
a)
6.02 x 1023
b)
- 6.02 1023
c)
6.02 x 1022
d)
6,020,000,000,000
2.
How many atoms are in 1 mole of NaCl?
a)
6.02 x 1023
b)
58
c)
11
d)
17
3.
Find the percentage composition of Mg in Mg3(PO4)2.
a)
27.74% Mg
b)
43.11% Mg
c)
16.00% Mg
d)
12.63% Mg
4.
What is the molar mass of table salt (NaCl)?
a)
116.88 g/mol
b)
35.45 g/mol
c)
22.99 g/mol
d)
58.44 g/mol
5.
What is the mass percentage of Carbon in Carbon dioxide (CO2)?
a)
27.29%
b)
42.86%
c)
72.73%
d)
72.72%
6.
What are the units in molar mass?
a)
grams
b)
moles
c)
moles/gram
d)
grams/mole
7.
Which of the following dimensional analysis setups will correctly convert 27.76g of Li to atoms of Li?
a)
A
b)
B
c)
C
d)
D
8.
How many moles are in 16.94 g of water?
a)
16.94 mol H2O
b)
0.9401 mol H2O
c)
305.3 mol H2O
d)
1.063 mol H2O
9.
How many molecules are in 9.44 moles of AlCl3?
a)
5.68 molec AlCl3
b)
5.68x1024 molec AlCl3
c)
1.25 molec AlCl3
d)
1.25x1023 molec AlCl3
10.
How many molecules are in 3.6 grams of NaCl?
a)
0.06
b)
1.0x1021
c)
1.3x1026
d)
3.7x1022
11.
Calculate the number of atoms in 4.00 x 10-5 g of sodium.
a)
1.05 x 1018 atoms
b)
3.92 x 1019 atoms
c)
3.24 x 1023 atoms
d)
5.54 x 1020 atoms
12.
How many moles are in 22 g of argon?
a)
880 moles
b)
0.55 moles
c)
1.81 moles
d)
5 moles
13.
How many moles are in 15 grams of lithium?
a)
0.5 moles
b)
104.1 moles
c)
2.2 moles
d)
50 moles
14.
How many grams are in 11.9 moles of chromium?
a)
50 g
b)
619 g
c)
0.23 g
d)
4.4 g
15.
How many grams are in 4.5 moles of sodium fluoride, NaF?
a)
0.1 g
b)
9.3 g
c)
100 g
d)
189 g
16.
Which of the following is NOT needed to calculate percent composition?
a)
Mass of specific element
b)
Molar Mass
c)
Avogadro's Number
d)
Division
17.
What is the molar mass of Hydrogen Peroxide (H2O2)?
a)
48 g/mole
b)
34.02 g/mole
c)
36.5 g/mole
d)
35.5 g/mole
18.
Which has more atoms, 12.0 mol of C or 12.0 mol of Ca?
a)
12.0 mol C
b)
12.0 mol Ca
c)
They are equal
19.
4.0 moles of H2O would have what mass?
a)
72 g
b)
23 g
c)
68 g
d)
4.5 g
20.
How many atoms of carbon are in 6.00g of carbon?
a)
1.20x1024atoms C
b)
6.02x1023atoms C
c)
3.01x1023atoms C
d)
1.50x1023atoms C
21.
How many grams are in 1.2 x 1024 molecules of CO?
a)
28 grams
b)
56 grams
c)
6.02 grams
d)
1.2 grams
22.
How many steps are in a gram to mole conversion?
a)
1
b)
2
c)
3
d)
4
23.
How many steps are in a gram to molecule conversion?
a)
1
b)
2
c)
3
d)
4
24.
The mass of one mole of substance is called...
a)
molecular mass
b)
mole constant
c)
molar mass
d)
atomic weight
25.
What is the mass of one mole of aluminum?
a)
26.98 g
b)
13 g
c)
53.98 g
d)
14 g
26.
What is the molar mass of AgF?
a)
514.9 g/mol
b)
99.7 g/mol
c)
126.87 g/mol
d)
198.8 g/mol
27.
Which compound below has the smallest molar mass?
a)
CO
b)
CO2
c)
H2O
d)
H2O2
28.
Which has a greater mass: 1 mole of sodium (Na) or 2 moles of lithium (Li)?
a)
1 mole of sodium
b)
2 moles of lithium
c)
neither
d)
more information is needed.
29.
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
30.
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
31.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
32.
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
33.
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
34.
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
35.
Which of the following represents an empirical formula?
a)
H2O2
b)
HC2O4
c)
H2O6
d)
H12O48
100 %
