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Molecules / Atoms to Moles to Grams

Total questions: 50

Worksheet time: 5hrs 52mins

Name
Class
Date
1.

When you are solving for molecules, atoms, and particles you always use what number?

a)

6.02 X 1023

b)

6.02 X 1022

c)

2 mole

d)

avogadro's number

2.

If you have moles on top, what information do you need on the bottom of the conversion factor?

a)

6.02 x 10 23 atoms

b)

particles

c)

18 grams

d)

moles

3.

How many molecules are in 27.5 grams of NaOH

a)

41.4 molecules

b)

4.14 x 1023 molecules

c)

4.14 x 1025 molecules

d)

1.83 x 10-21 molecules

4.

How many moles are in 2.85 x 1018 atoms of iron, Fe?

a)

41.4 molecules

b)

4.14 x 1023 molecules

c)

4.14 x 1025 molecules

d)

1.83 x 10-21 molecules

5.

How many moles are in 3.01 x 1022 atoms of magnesium, Mg?

a)

0.05 moles

b)

1.81 X 1046 moles

c)

5.00 x 1021 moles

d)

5 moles

6.

What is the molar mass of CaCO3?

a)

98 g/mol

b)

100 g/mol

c)

124 g/mol

d)

130 g/mol

7.

How many atoms are in 1 molecule of Al(NO3)3?

a)

3

b)

12

c)

13

d)

15

8.

What is the molar mass of HCl?

a)

20.5 g/mol

b)

26.5 g/mol

c)

30 g/mol

d)

36.5 g/mol

9.

What is the formula of calcium nitrate?

a)

Ca(NO2)2

b)

Ca(NO3)2

c)

Ca(NO3)2

d)

Ca(NO3)3

10.

How many moles of sulfur is 64 grams of sulfur?

a)

.5 moles

b)

1 mole

c)

1.5 mole

d)

2 moles

11.

How many moles is 22 grams of carbon dioxide (CO2)?

a)

.5 moles

b)

1 mole

c)

1.5 mole

d)

2 moles

12.

What is the formula of copper (I) sulfide?

a)

CuS

b)

Cu2S

c)

CuSO4

d)

Cu2SO4

13.

How many grams is 6 moles of potassium atoms?

a)

114

b)

240

c)

25

d)

300

14.
What are the units for molar mass?
a)
grams
b)
amu
c)
grams per mole
d)
liters
15.
What is the molar mass of Hydrogen Peroxide (H2O2)?
a)
48.10 g/mol
b)
34.02 g/mol
c)
36.54 g/mol
d)
35.51 g/mol
16.
How many molecules are in 9.44 moles of AlCl3?
a)
5.68 molec AlCl3
b)
5.68x1024 molec AlCl3
c)
1.25 molec AlCl3
d)
1.25x1023 molec AlCl3
17.
Which of the following would have the highest number of moles?
a)
4 g CO2
b)
15 g H2O
c)
22 g NaCl
d)
100 g AgCl
18.
How many moles of magnesium are in 3.01x1022 atoms of magnesium?
a)
5.00x1044 moles Mg
b)
0.050 moles Mg
c)
1.81x1046 moles Mg
d)
5 moles Mg
19.
Which of the following would have the highest mass?
a)
0.75 mol Co3(PO4)2
b)
12 mol CH4
c)
16.2 mol chlorine gas
d)
1.2 mol IrI3
20.
You have 8.65 x 1025 atoms of arsenic. How many grams do you have?
a)
144 g As
b)
10,765 g As
c)
107 g As
d)
None of these
21.
How many grams of carbon are in 0.63 moles of carbon?
a)
3.79x1023 g C
b)
.0524 g C
c)
7.57 g C
d)
.800 g C
22.
How many molecules are in 3.6 grams of NaCl?
a)
0.06
b)
1.0x1021
c)
1.3x1026
d)
3.7x1022
23.
Calculate the number of nitrogen atoms in 20.9 grams of nitrogen.
a)
1.49 moles
b)
0.746 moles
c)
0.37 moles
d)
1.74 moles
24.
What is the mass of 1.0 x 1012 molecules of O2?
a)
1.9 x 1013 g
b)
6.0 x 1011 g
c)
5.3 x 10-11 g
d)
1.7 x 10-12 g
25.
Which represents the greatest number of atoms?
a)
50.0 g Cs
b)
50.0 g Co
c)
50.0 g Ca
d)
50.0 g Cu
26.
What is the molar mass of sodium sulfate, Na2SO4?
a)
71.06 g/mol
b)
94.05 g/mol
c)
142.1 g/mol
d)
215.1 g/mol
27.

Identify the number of moles in 6.02 x 1023 molecules of H2O.

a)

1 mole

b)

2 moles

c)

6.02 moles

d)

6.02 x 1023 moles

28.

Identify the type of Representative Particle.

One mole of sulfur hexafluoride (SF6) contains 6.02 x 1023 _____.

a)

atoms

b)

formula units

c)

ions

d)

molecules

29.

Find the mass of 11.37 mol of BaO. Round to the nearest whole number.

a)

1,354 g

b)

1,740 g

c)

17.40 g

d)

1,684 g

30.

Determine the number of moles of AlNO3 that are in 264 g of the compound.

a)

2.97 mol

b)

3.45 mol

c)

2.73 mol

d)

1.86 mol

31.

Determine the amount of moles in CuBr that are in 276.9 g of the compound.

a)

3.2 mol

b)

1.7 mol

c)

2.1 mol

d)

1.9 mol

32.

Find the mass of 5.82 mol of MgCl2. Round to the nearest tenth.

a)

552.9 g

b)

436.8 g

c)

55.2 g

d)

555.9 g

33.

Find the mass of 3.6 mol of Au.

a)

843.6 g

b)

709.2 g

c)

435.9 g

d)

196.9 g

34.

Determine the number of moles of KNO3 that are in 784 g of the compound.

a)

7.7 mol

b)

6.9 mol

c)

10.6 mol

d)

7.8 mol

35.

How many atoms are in 9.44 moles of Al?

a)

5.68 atomsAl

b)

5.68x1024 atoms Al

c)

0.705 atoms Al

d)

1.25x1023 atoms Al

36.
How many moles are 2.85 x 1018 atoms of iron?
a)
4.73 x 10-6 moles
b)
1.72 x 1042 moles
c)
1.72 x 10-42 moles
d)
4.73 x 106 moles
37.
Avogadro's number of representative particles is equal to one_____.
a)
kilogram
b)
gram
c)
kelvin
d)
mole
38.

What is the mass of one mole of silver?

a)

32.06 g

b)

107.87 g

c)

14.01 g

d)

22.99 g

39.

How many steps are in a gram to atom conversion?

a)

1

b)

2

c)

3

d)

4

40.

Which of the following statements regarding the mole is INCORRECT?

a)

A mole is a unit of quantity equal to 6.02 x 1023 particles.

b)

The number of particles in a mole is known as Avogadro’s number.

c)

A mole of particles of an element is numerically equal to the atomic mass of the element.

d)

none of the above

41.

The mass of one mole of an element is equal to

a)

its atomic number from the periodic table, but in amus.

b)

its atomic mass from the periodic table, but in amus.

c)

its atomic mass from the periodic table, but in grams.

d)

its atomic number from the periodic table, but in grams.

42.

Shivani measures out 6.0 moles of epsom salt (MgSO4) to put in her bath. How many grams of MgSO4 went in the bath?

a)

3.6 x 1024 g

b)

720 g

c)

0.050 g

d)

340 g

43.
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
d)
1.91 x 1022
44.

Determine the mass of 4.20 moles of C6H12

a)

353 g

b)

0.0499 g

c)

337 g

d)

2.53 x 1024 g

45.

Calculate the number of atoms in 0.0340 g Zn.

a)

5.20 x 10-4 atoms Zn

b)

3.13 x 1023 atoms Zn

c)

3.13 x 1020 atoms Zn

d)

2.05 x 1022 atoms Zn

46.

How many grams are in 1.2 moles of neon?

a)

0.059 grams

b)

7.2 x 1023 grams

c)

2.0 x 10-24 grams

d)

24 grams

47.

How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3?

a)

1.26 moles

b)

0.8 moles

c)

7,670 moles

d)

1.63 x 10-22 moles

48.

What is the molar mass of table salt (NaCl)? Read all options! Be careful!

a)

58.44 amu

b)

35.45 g/mol

c)

22.99 g/mol

d)

58.44 g/mol

49.

To melt the ice, Juan throws 455 g of calcium chloride, CaCl2 on his sidewalk. How many moles of CaCl2 did he throw?

a)

50,500 moles

b)

4.10 moles

c)

7.56 x 10-22 moles

d)

111 moles

50.

If I had 17.0 grams of Hydrogen (H) in the compound HCl, how many grams of Chloride (Cl) would we have?

a)

597.9 g Cl

b)

0.4757 g Cl

c)

46.23 g Cl

d)

2.563 g Cl

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