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WorksheetsMoles
Total questions: 25
Worksheet time: 29mins
Name
Class
Date
1.
How many molecules in 2 moles of methane (CH4) ?
a)
2 x 6 x 1023
b)
10
c)
2
d)
2 / 6 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.
How many atoms of H in 3.5 moles of CH3COOH?
a)
3.5 x 3
b)
3.5 x 4
c)
3.5 x 6 x 1023
d)
3.5 x 4 x 6 x 1023
4.
What is the total moles of oxygen in 0.5 moles CO2 and 1.5 moles O2
a)
2
b)
2.5
c)
4
d)
3.5
5.
How many bananas in 3.5 moles of bananas?
a)
3.5
b)
3.5 x 6 x 1023
c)
35 / 6 x 1023
6.
How many moles of atoms in 3 moles of H2O?
a)
3
b)
3 x 6 x 1023
c)
9
7.
How many molecules in 2 moles of methane (CH4) ?
a)
2 x 6 x 1023
b)
10
c)
2
d)
2 / 6 x 1023
8.
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
9.
What is the total number of C atoms in 1.5 moles CO2 and 0.5 moles of C2H4 ?
a)
2
b)
2.5 x 6 x 1023
c)
2 x 6 x 1023
d)
2.5
10.
A mole of potassium chloride contains 6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
11.
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
12.
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.
13.
What is the mass of 2.50 mol of oxygen gas O2?
a)
40 g
b)
80 g
c)
16 g
d)
32 g
14.
Avogadro's number of representative particles is equal to one_____.
a)
kilogram
b)
gram
c)
kelvin
d)
mole
15.
What do we call the SI unit for amount of a substance?
a)
Avogadros number
b)
kilogram
c)
mole
d)
liter
16.
How many atoms of carbon are in five molecules of propane, C3H8?
a)
40
b)
3
c)
15
d)
8
17.
What is the difference between a formula unit and a molecule?
a)
formula unit - ionic bond
molecule - covalent bond
molecule - covalent bond
b)
formula unit - big
molecule - small
molecule - small
c)
formula unit - covalent bond
molecule - ionic bond
molecule - ionic bond
d)
formula unit - small
molecule - big
molecule - big
18.
Fluorine is diatomic. What is the molar mass of fluorine gas?
a)
18.998 g/mol
b)
37.996 g/mol
c)
9 g/mol
d)
18 g/mol
19.
The mole concept is important in chemistry because
a)
it allows us to distinguish between elements and compounds.
b)
atoms and molecules are very small and the mole concept allows us to count atoms and molecules by weighing macroscopic amounts of material.
c)
it establishes a standard for reaction stoichiometry.
d)
it provides a universally accepted standard for mass.
20.
What is the molar mass of Carbon?
a)
6
b)
12
c)
20
d)
40
21.
What does not belong?
a)
particles
b)
atoms
c)
elements
d)
molecules
22.
How many moles are in a 18 L tank of nitrogen gas at STP?
a)
0.9 moles
b)
1 mole
c)
0.8 moles
d)
0.75 moles
23.
What is the volume occupied by 1 mole of any gas at STP?
a)
44.8 L
b)
22.4 L
c)
16.8 L
d)
20.4 L
24.
What is the volume of 5 moles of oxygen gas at STP?
a)
112 L
b)
22.4 L
c)
78.8 L
d)
114.24 L
25.
What is the volume of 3 moles of hydrogen gas at STP?
a)
22.4 L
b)
44.8 L
c)
67.2 L
d)
89.6 L
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