Worksheetsmole concept
Total questions: 10
Worksheet time: 11mins
Name
Class
Date
1.
The molecular formula for a carbon and hydrogen compound is C8H18. What is the empirical formula?
a)
C8H18
b)
C9H4
c)
C18H8
d)
C4H9
2.
An empirical formula is defined as _______?
a)
The lowest whole number ratio of atoms in a formula.
b)
The actual whole number ratio of atoms in a formula.
c)
The formula showing the ratio of atoms in a formula.
d)
The formula showing the ratio of moles in a formula.
3.
What is the molar mass of CO2?
a)
22.0 g/mol
b)
28.0 g/mol
c)
44.0 g/mol
d)
56.0 g/mol
4.
A mole of Neon contains
6.02 x 1023 _____.
6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
5.
What is the molar mass of NaCl?
a)
58 g/mol
b)
28 g/mol
c)
12 g/mol
d)
6.02 x 1023
6.
What is the molar mass of one molecule of Nitrogen N2?
a)
14 amu (atomic mass units)
b)
14 g
c)
28 g
d)
28 amu
7.
6CO2 + 6H2O --> C6H12O6 + 6O2
What is the total number of moles of CO2 needed to make 2 moles of C6H12O6?
a)
2.5
b)
6
c)
12
d)
15
8.
A mole of carbon dioxide contains 6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
9.
Identify the limiting reagent when 6.00 moles HCl combines with 5.00 moles Mg to form MgCl2.
1 Mg + 2 HCl --> 1 MgCl2 + 1 H2
1 Mg + 2 HCl --> 1 MgCl2 + 1 H2
a)
Mg
b)
H2
c)
MgCl2
d)
HCl
10.
When 12 moles of O2 reacts with 6 moles of C10H8, what is the limiting reactant?
1 C10H8 + 12 O2 --> 10 CO2 + 4 H2O
1 C10H8 + 12 O2 --> 10 CO2 + 4 H2O
a)
Oxygen
b)
C10H8
c)
Water
d)
Carbon Dioxide
100 %
