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Review HMRK Unit 6

Total questions: 62

Worksheet time: 16hrs 30mins

Name
Class
Date
1.

What is Avogadro's number?

a)

6.02 x 1023

b)

1 mole

c)

600 million

d)

6.02

2.

How many moles are in 6.02 x 1023 molecules of H2O?

a)

1 mole

b)

2 moles

c)

6.02 moles

d)

602000000000000000000000 moles

3.

One mole of carbon dioxide (CO2) contains 6.02 x 1023 _____.

a)

atoms

b)

formula units

c)

ions

d)

molecules

4.

How many moles are in 8.30 X 1023 molecules of H2O?

a)

1.38 X 1023 moles H2O

b)

1.38 moles H2O

c)

2 moles H2O

d)

1 mole H2O

5.

How many molecules are there in 31.8 moles of water?

a)

5.28 x 10-23 molecules

b)

1.91 x 1025 molecules

c)

5.28x 10-25 molecules

d)

1.91 x 1023 molecules

6.

A mole is:

a)

The SI unit for mass

b)

The SI unit for the amount of a substance

c)

The SI unit for volume

d)

The SI unit for area

7.

What is the conversion factor that should be used to determine how many molecules are there in 4.00 moles of glucose, C6H12O6?

a)
b)
c)
d)
8.

Which has the most particles?

a)

1 mole H2

b)

1 mole Na1+

c)

1 mole Al(OH)3

d)

These are all the same

9.

What is the correct equation to determine how many calcium ions (Ca2+) in 2 moles?

a)
b)
c)
d)

This cannot be determined as calcium is not bonded.

10.

How many moles of Na contain 1.45 x 1021 atoms of Na?

a)

8.73 x 1044 moles

b)

8.73 moles

c)

0.00241 moles

d)

2.41 x 1044 moles

11.

What is the correct equation to calculate the number of moles in 3.13 x 1026 molecules of H2O2?

a)
b)
c)
d)
12.

How many grams are in 1.2 x 1024 molecules of CO? (molar mass of CO = 28 g/mol)

a)

28.2 g

b)

55.8 g

c)

6.02 g

d)

1.2 g

13.
A mole of Neon contains
6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
14.

How many molecules are in 2.00 moles of H2O?

a)

124x1024 molecules of H2O

b)

1.20x1023 molecules of H2O

c)

12.04 x1023 molecules H2O

d)

124

15.
How many atoms of iodine are in a mole of iodine?
a)
53
b)
63.55g
c)
126.9
d)
6.02 x 1023
16.

How many moles are 98.3 grams of aluminum hydroxide, Al(OH)3? (Ar Al=27, H=1, O=16)

a)

1.26 moles

b)

0.8 moles

c)

7,673.4 moles

d)

150 moles

17.
How many molecules are in 2.00 moles of H2O?
a)
124x1024 molecules of H2O
b)
1.20x1023 molecules of H2O
c)
1.20x1024 molecules H2O
d)
124
18.

How many Mg atoms are present in 3.00 moles of MgCl2 ?

a)

1.81 x 10^24

b)

3.02 x 10^24

c)

12.0 x 10^25

d)

16.0 x 10^23

19.
What is the molar mass of NaOH?
a)
368 g/mole 
b)
40 g/mole
c)
57 g/mole
d)
23 g/mole
20.
What is the mass of one mole of AuCl3?
a)
96g
b)
130g
c)
232.5g
d)
303.5g
21.
What is the mass of one mole of (NH4)2CO3?
a)
144g
b)
138g
c)
96g
d)
74g
22.
36.0 g of Be contains how many moles?
a)
0.25 mol
b)
4.0 mol
c)
45 mol
d)
320 mol
23.
4.0 moles of H2O would have what mass?
a)
72 g
b)
23 g
c)
68 g
d)
4.5 g
24.
A mass of 6 g of Carbon contains
a)
1 mole of C
b)
2 moles of C
c)
0.5 moles of C
d)
72 moles of C
25.
How many moles are in 22 g of argon? 
a)
880 moles
b)
0.55 moles
c)
1.81 moles
d)
5 moles
26.
How many moles are in 15 grams of lithium?
a)
0.5 moles
b)
104.1 moles
c)
2.2 moles
d)
50 moles
27.
How many grams are in 88.1 moles of magnesium?
a)
2141 g
b)
0.3 g
c)
30 g
d)
3.6 g
28.
What is the molar mass of Mn2Se7?
a)
134 g/mole
b)
663 g/mole
c)
189 g/mole
d)
608 g/molw
29.
What is the molar mass of (NH4)2SO4?
a)
66 g/mole
b)
114 g/mole
c)
100 g/mole
d)
132 g/mole
30.
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
31.
How many moles are 98.3 grams of aluminum hydroxide, Al(OH)3?
a)
1.26 moles
b)
0.8 moles
c)
7,673.4 moles
d)
150 moles
32.
How many grams are in 0.02 moles of beryllium iodide, BeI2?
a)
13,150 g
b)
0.0007 g
c)
5.3 g
d)
50 g
33.
How many moles are in 68 grams of copper (II) hydroxide, Cu(OH)2?
a)
1.4 moles
b)
0.7 moles
c)
6,630 moles
d)
50 moles
34.
How many moles are present in a 32.5 sample of aluminum chloride?
a)
720 moles
b)
1.2 moles
c)
0.2 moles
d)
0.5 moles
35.

What is the empirical formula for C4H6?

a)

CH

b)

CH3

c)

C2H3

d)

C4H6

36.

What is the empirical formula for N2S3?

a)

NS

b)

N3S2

c)

N2S3

d)

N1S1.5

37.
What is the percent by mass of oxygen in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
38.
What is the percent by mass of sodium in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
39.
What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
40.
What is the percent composition by mass of oxygen in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
41.
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
42.
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
43.
Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.
a)
 NaPO2
b)
Na2PO3
c)
Na3PO4
d)
NaPO4
44.
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 
45.
What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?
a)
C3H8
b)
CH4
c)
C2H2
d)
C4H10
46.

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

47.
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
48.
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 
49.

What is the molecular formula of a compound with an empirical formula of C2OH4 and a molar mass of 88 grams per mole?

a)

C2O4H8

b)

C8O2H4

c)

C4O2H8

d)

C4O8H2

50.
What is the percent by mass of magnesium in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
51.
What is the percent by mass of chlorine in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
52.
What is the percent by mass of calcium in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
53.
What is the percent composition by mass of magnesium in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
54.
In which compound is the percent composition by mass of Cl equal to 42%?
a)
HClO (gram formula mass = 52 g/mol)
b)
HClO2 (gram formula mass = 68 g/mol)
c)
HClO3 (gram formula mass = 84 g/mol)
d)
HClO4 (gram formula mass = 100 g/mol)
55.

What percentage of the total atomic mass of carbon monoxide (CO) is composed of oxygen?

a)

29%

b)

43%

c)

57%

d)

73%

56.

Magnesium bromide (one magnesium atom with two bromine atoms) has a chemical formula of MgBr2. If you look at the total atomic mass of MgBr2, does magnesium or bromine make up more of the mass?

a)

bromine

b)

magnesium

c)

they are exactly the same

d)

it is impossible to tell

57.

What percentage of the total atomic mass of lithium phosphide (Li3P) is composed of phosphorus?

a)

13%

b)

29%

c)

40%

d)

60%

58.

What percentage of the total atomic mass of calcium nitrate (Ca(NO3)2) is composed of nitrogen? Hint - another way to think of calcium nitrate is Ca(NO3)(NO3).

a)

17%

b)

24%

c)

29%

d)

59%

59.

What percentage of the total atomic mass of lithium phosphide (Li3P) is composed of lithium? Hint - consider all three atoms of lithium in your calculation.

a)

13%

b)

29%

c)

40%

d)

60%

60.
What is the percent by mass of sodium in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
61.

What percentage of the total atomic mass of magnesium bromide (MgBr2) is composed of magnesium?

a)

13%

b)

43%

c)

63%

d)

87%

62.

What percentage of the total atomic mass of carbon monoxide (CO) is composed of oxygen?

a)

29%

b)

43%

c)

57%

d)

73%

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