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Unit 8 Chemistry practice

Total questions: 44

Worksheet time: 4hrs 40mins

Name
Class
Date
1.

One mole of Chrominum contains:

a)

51.97x10^23 atoms

b)

2.06x10^23atoms

c)

6.02x10^23atoms

d)

12.04x10^23atoms

2.

The mass of one mole of Ca(NO3)2 is:

a)

134 grams/mole

b)

199 grams/mole

c)

148 grams/mole

d)

164 grams/mole

3.

The % of Aluminum found in Al2(SO4)3 is:

a)

7.89%

b)

15.77%

c)

84.23%

d)

92.11%

4.

How many moles are equal to 4.0x10^23 atoms of Germanium?

a)

.66 mole

b)

1 mole

c)

1.66 mole

d)

6.02 moles

5.

36.0 g of Be contains how many moles?

a)

.25 moles

b)

4.0 moles

c)

45.0 moles

d)

320 moles

6.

.075 moles of Titanium contains how many atoms?

a)

4.5x10^22

b)

1.2x10^-25

c)

3.6

d)

6.4x10^2

7.

In which of the following molar quantities of Sulfur would 8.13x10^23 atoms of sulfur be present?

a)

1.15 moles S

b)

1.25 moles S

c)

1.35 Moles S

d)

1.45 moles S

8.

Avogadro's number of P atoms would have a mass of

a)

6.02x10^-23 grams

b)

6.02x10^23 grams

c)

15.0 grams

d)

31 grams

9.

How many molecules of CO2 are present in 134 g of CO2?

a)

1.83x10^23

b)

5.06x10^23

c)

9.79x10^24

d)

3.55x10^26

10.

For the problem, what is the mass, in grams of 3.00x10^6 atoms of F? Which numbers should replace A and B?

3.00x10^6atomsF X A moles F/B atoms F

a)

6.02 x 10^23 and 1

b)

1 and 6.02 x 10^23

c)

1 and 19.00

d)

19.00 and 6.02 x 10^23

11.

How many moles are present in 19.82 g Mg?

a)

.8156moles

b)

1.000 moles

c)

1.226 moles

d)

481.7 moles

12.

The simplest whole number ratio of the atoms present in a compound is its:

a)

molecular formula

b)

empirical formula

c)

formula unit

d)

molar mass

13.

What is the empirical formula of a compound with a molecular formula of C12H24O6?

a)

CHO

b)

C2H4O2

c)

C4H8O2

d)

C2H4O

14.

What is the empirical formula of a compound composed of 14.4% Hydrogen and 85.6% Carbon?

a)

CH2

b)

CH3

c)

C2H3

d)

C2H5

15.

What is the molecular formula of a compound with the empirical formula CH2O and a molecular mass of 180g?

a)

C9H18O9

b)

CH2O

c)

C6H12O6

d)

C2H4O2

16.

What is the molecular formula of a compound with an empirical formula of NO2 and a formula mass of 92.02 amu

a)

NO2

b)

N2O4

c)

NO

d)

N4O8

17.

The molecular formula of a compound is the:

a)

Formula showing the actual ratio of atoms in the compound

b)

Formula showing the most simplified ratio of atoms in the compound

c)

formula showing the ideal ratio of atoms in a compound

d)

Formula showing the theoretical ratio of atoms in the compound

18.
What is the definition of molar mass?
a)
number of grams per one mole of a substance
b)
whole number ratio that is a multiple of a chemical formula
c)
simplest, whole number ratio of a chemical formula
d)
6.02 x 10^23 particles per one mole of a substance
19.
Molar mass is in units of ________.
a)
grams
b)
grams/mole
c)
mole
d)
moles/gram
20.
What is the molar mass of AuCl3?
a)
96 g
b)
130 g
c)
232.5 g
d)
303.3 g
21.
What is the definition for Avogadro's number?
a)
number of grams per one mole of a substance
b)
whole number ratio that is a multiple of a chemical formula
c)
simplest, whole number ratio of a chemical formula
d)
6.02 x 10^23 particles per one mole of a substance
22.
What is the mass in grams of 5.90 mol C8H18?
a)
.0512 g
b)
19.4 g
c)
673 g
d)
389 g
23.
How many moles are present in 32.3 grams of carbon dioxide (CO2)?
a)
44.01 moles
b)
1421.52 moles
c)
32.3 moles
d)
0.73 moles
24.
What is the mass of 2.50 mol of oxygen gas O2?
a)
40 g
b)
80 g
c)
16 g
d)
32 g
25.
How many water molecules are in 5.2 moles of water?
a)
6.02 x 1023
b)
5.2
c)
3.1304 x 1024
d)
8.638 x 10-24
26.
Which would have more atoms?
a)
1 mole of Li
b)
1 mole of Au
c)
1 mole of Si
d)
None, all are equal
27.
What is the mole used for? 
a)
To measure the amount of grams in a substance
b)
To measure the amount of atoms or molecules in a substance
c)
To measure the amount of energy in a substance
d)
To measure the amount of bonding in a substance 
28.
How many grams are in 11.9 moles of chromium?
a)
50 g
b)
619 g
c)
0.23 g
d)
4.4 g
29.

1 mole of Ca and 1 mole of Na have the same number of atoms.

a)

True

b)

False

30.

1 mole is equivalent to 6.02 x 1023

a)

False

b)

True

31.

What is a mole?

a)

The standard “unit” for measuring the amount of particles in a substance.

b)

The abbreviation for the term molecule.

c)

The relative mass of one atom of an particular element.

d)

A dark, hairy spot on your arm.

32.

How many atoms are found in 1 mol of Xenon atoms?

a)

6.02 x 1023

b)

3.01 x 1023

c)

1.204 x 1024

d)

6.02 x 1024

33.
What is molar mass?
a)
The mass of an atom
b)
The mass of a mole of atoms
c)
The mass of a cute little star-nosed mole
d)
When did we talk about this?
34.

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

a)

27 g

b)

13 g

c)

54 g

d)

14 g

35.
How many molecules are in 2.5 mol of NaCl?
a)
1.51x1023
b)
146
c)
4.15
d)
1.51x1024
36.
What is the definition of molar mass?
a)
number of grams per one mole of a substance
b)
whole number ratio that is a multiple of a chemical formula
c)
simplest, whole number ratio of a chemical formula
d)
6.02 x 10^23 particles per one mole of a substance
37.
Molar mass is in units of ________.
a)
grams
b)
grams/mole
c)
mole
d)
moles/gram
38.
What is the molar mass of AuCl3?
a)
96 g
b)
130 g
c)
232.5 g
d)
303.3 g
39.
What is the definition for Avogadro's number?
a)
number of grams per one mole of a substance
b)
whole number ratio that is a multiple of a chemical formula
c)
simplest, whole number ratio of a chemical formula
d)
6.02 x 10^23 particles per one mole of a substance
40.
Which would have more atoms?
a)
1 mole of Li
b)
1 mole of Au
c)
1 mole of Si
d)
None, all are equal
41.
How many moles are present in 32.3 grams of carbon dioxide (CO2)?
a)
44.01 moles
b)
1421.52 moles
c)
32.3 moles
d)
0.73 moles
42.
What is the mass in grams of 5.90 mol C8H18?
a)
.0512 g
b)
19.4 g
c)
673 g
d)
389 g
43.
What is the mass of 2.50 mol of oxygen gas O2?
a)
40 g
b)
80 g
c)
16 g
d)
32 g
44.
How many water molecules are in 5.2 moles of water?
a)
6.02 x 1023
b)
5.2
c)
3.1304 x 1024
d)
8.638 x 10-24

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