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The Mole Concept - Gen Chem

Total questions: 24

Worksheet time: 43mins

Name
Class
Date
1.

What is the difference between a formula unit and a molecule?

a)

formula unit - ionic compound

molecule - covalent/molecular compound

b)

formula unit - big

molecule - small

c)

formula unit - covalent/molecular compound

molecule - ionic compound

d)

formula unit - small

molecule - big

2.
A mole of potassium chloride contains 6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
3.
A mole of carbon dioxide contains 6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
4.
A mole of carbon contains 6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
5.
Which compound has the smallest molar mass?
a)
CO
b)
CO2
c)
H2O
d)
H2O2
6.
Which of these has the greatest volume?
a)
1 mole CO2
b)
1 mole of N2O4
c)
1 mole of C3H8
d)
They all have the same volume
7.
Which has more molecules?
a)
1 mole CO2
b)
1 mole of N2O4
c)
1 mole of H2O
d)
They are all the same
8.

What is the molar mass of lead(II) nitrate, Pb(NO3)2 ?

a)

237.22 g/mol

b)

283.22 g/mol

c)

269.22 g/mol

d)

331.22 g/mol

9.

What is the molar mass of sodium (Na)?

a)

11.45 g/mol

b)

22.99 g/mol

c)

1.01 g/mol

d)

3.03 g/mol

10.

How many moles of oxygen (O2) are in 32.00 g of O2?

a)

6.02 x1023 moles

b)

2 moles

c)

1 mole

d)

1.93 x1025 moles

11.
What is the mass of 2.50 mol of oxygen gas O2?
a)
40.0 g
b)
80.0 g
c)
16.0 g
d)
32.0 g
12.

What is the molar mass of CO2?

a)

22.01 g/mol

b)

16.00 g/mol

c)

32.00 g/mol

d)

44.01 g/mol

13.

What is the molar mass of Ca(NO3)2?

a)

204.18 g/mol

b)

142.17 g/mol

c)

164.10 g/mol

d)

150.09 g/mol

14.

What is the mass of one mole of aluminum (Al)?

a)

26.98 g/mol

b)

13.49 g/mol

c)

53.96 gmol

d)

14.01 g/mol

15.

What is the molar mass of table salt (NaCl)?

a)

805 g/mol

b)

35.45 g/mol

c)

22.99 g/mol

d)

58.44 g/mol

16.

What is the mass of 0.89 moles of calcium chloride (CaCl2)?

a)

0.89 g

b)

99 g

c)

99 amu

d)

0.89 amu

17.
How many atoms are in 0.500 mole of aluminum?
a)
500 Al atoms
b)
6.02 * 1023 Al atoms
c)
3.01 * 1023 Al atoms
d)
5000 Al atoms
18.
How many moles of barium nitrate, Ba(NO3)2, contain 6.8 x 1024 formula units?
a)
6.02 x 1023 formula units
b)
11 moles
c)
11 formula units
d)
11 g
19.

How many moles is 397 g of calcium chloride (CaCl2)?

a)

111 moles

b)

3.58 moles

c)

0.280 moles

d)

44100 moles

20.

How many L of carbon dioxide is 3.58 moles?

a)

6.02 x 1023 formula units

b)

80.2 L

c)

22.4 L

d)

158 L

21.

What is the volume in L of 2.89 mol of CO2 gas?

a)

127 L

b)

64.7 L

c)

1.74 x1024 L

d)

49.0 L

22.
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
23.
Which one is an empirical formula?
a)
H2O2
b)
C2H6O12
c)
CaCl2
d)
N2O8
24.

What is the empirical formula given the data below?


0.050 mol C

0.150 mol H

0.100 mol O

a)

CHO

b)

CH2O

c)

CH3O

d)

CH3O2

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