I pledge allegiance to the mole, to the International
Union of Pure and Applied Chemistry, and to the atomic
mass for which it stands, one number, most divisible,
with atoms and molecules for all.
The Mole
23
6.02 x 10
.
The Mole
Average Chemistry
Re: 11/11 JG
Molar Mass Molecular Weight
I.Calculate the molar mass for each of the following elements or molecules.
Include all units. Must show work to receive credit.
II. For each compound calculate the % composition of the first element
in each formula.
1. iron
2. chromium
3. chlorine
4. water
5. sulfur
6. H3PO4
7. iron(II) sulfate
8. ammonium phosphate
9. Cu(NO3)2
10. CH3COOH
11. magnesium chloride
12. mercury(II) oxide
13. Al2(SO4)3
14. C12H22O11
15. copper(I) iodide
16. potassium nitride
17. tetraphosphorous decoxide
18. cobalt (I) carbonate
Notes:
Notes:
HOLY MOLEY
6.02 x 1023 atoms or molecules = 1 mole = molar mass in grams
ANSWER EACH OF THE FOLLOWING QUESTIONS USING THE FACTOR-LABEL METHOD
mole-grams conversions
1. How many moles are contained in 102.0 grams of water?
2. How many grams is 2.00 x 10-2 moles of nickel?
3. How many moles is 15.0 grams of iron(II) nitrate?
4. How many grams is 4.23 moles of oxygen?
5. What is the mass in grams of 3.49 moles of sodium chloride?
mole-atom/molecule conversions
6. How many atoms of lithium are contained in 6.22 moles of lithium?
7. How many moles are contained in 3.24 x 10
25
molecules of nitrogen?
8. How many molecules are in 0.0130 moles of sulfur trioxide?
9. How many moles are contained in 9.20 x 10
29
molecules of nitrogen dioxide?
10. How many molecules are in 5.25 moles of water?
grams - atoms/molecules conversions
11. How many atoms is equivalent to 4.25 grams of beryllium?
12. How many grams are in 4.29 x 1023 molecules of potassium bromide?
13. How many molecules are there in 6.99 grams of carbon dioxide?
14. What is the mass in grams of 2.96 x 10
26
atoms of zinc?
All mixed up
15. How many atoms are in 2.45 moles of aluminum?
16. How many molecules are in 37.75 grams of magnesium hydroxide?
17. How many moles is 2.115 x 10
30
molecules of silver nitrate?
18. What is the mass in grams of 8.87 x 10 22 atoms of neon gas?
MOLE FUN
Answer each of the following using the factor-label method and showing all
work.
1. How many grams is 2.55 moles of hydrogen
2. How many grams are in a 0.625 mole sample of calcium hydroxide?
3. How many molecules are there in 3.45 moles of iron(III) chloride?
4. How many molecules are in a 29.42 gram sample of barium nitrate?
5. How many moles are there in 82.5 grams of aluminum oxide?
6. How many moles of octane(C8H18) are in 9.25 x 1032 molecules of C8H18?
7. How many grams of copper(II) chloride are in 3.92 x 1023 molecules?
8. How many grams are in 2.87 moles of cobalt(III) nitrate?
9. Caffeine has the molecular formula, C8H10O2N4. Calculate the mass in grams of
1.20 x 1020 molecules of caffeine.
10. How many molecules of nitrogen are there in 0.0254 grams of nitrogen?
11. How many molecules of copper(I) sulfate are there in 7.25 grams of copper(I) sulfate?
12.How many moles of ammonium phosphate are there in 4.67 x 1030 molecules of ammonium phosphate?
13. How many molecules are contained in 4.89 moles of calcium hydroxide?
14. How many moles of magnesium are in a 2.50 gram strip of magnesium?
15. How many moles in 3.89 x 1045 molecules of water?
Notes:
Lab Data Practice
Data:
Mass of aluminum before reaction
Mass of aluminum after reaction
Mass of test tube, cork, and Cu(NO3)2
Mass of empty test tube and cork
Mass of empty beaker
Mass of beaker and copper
4.596g
4.321g
8.856g
6.357g
95.621g
96.407g
1a. Write and balance the following reaction.
aluminum + copper(II) nitrate 
b. Identify the type of reaction.
2. How many grams of aluminum reacted?
3. How many moles of aluminum reacted?
4. What mass of copper was produced?
5. How many moles of copper were produced?
6. How many grams of copper (II) nitrate were reacted?
7. How many molecules of copper (II) nitrate were reacted?
8. According to the law of conservation of matter how many grams of aluminum
nitrate should have been produced?
Molar Mass, % Composition, Moles Review
1. How many molecules of iron(III) hydroxide are in 268.3 grams?
2. How many grams are in 5.1 moles of H2O?
3. Determine the mass in 4.81 x 1023 molecules of sulfur.
4. How many moles are in 9.32 x 1022 atom of lithium?
5. Find the % composition of aluminum in aluminum carbonate.
6. Find the % composition of oxygen in tin (IV) hydroxide.
Use this data to answer the questions:
Mass
Mass
Mass
Mass
Mass
Mass
of beaker
of vial, cork, silver nitrate
of empty vial, cork
of copper before reaction
of copper after reaction
of silver and beaker
53.86g
4.36g
1.91g
3.82g
3.36g
55.42g
1. Calculate the mass of copper reacted.
2. Calculate the atoms of copper reacted.
3. Calculate the mass of silver nitrate reacted.
4. Calculate the mole of silver nitrate reacted.
5. Calculate the mass of silver produced.
6. Calculate the atoms of silver produced.
7. According to the law of conservation of matter. How many grams of Cu(NO3)2
should be produced? Using the balanced equation below.
Cu + 2 AgNO3  2 Ag + Cu(NO3)2
Mole Packet Answers
Molar mass/molecular weight
1. 55.8g
2. 52.0g
11.1%
5. 256.8g
46.8%
6. 98.0g 3.1%
28.2%
9. 187.5g 33.9%
10. 60.0g 40.0%
85.5%
13. 342.3g 15.8%
14. 342.0g 42.1%
89.3%
17. 284.0g 43.7%
18. 177.8g 66.3%
3. 71.0g
4. 18.0g,
7. 151.9g 36.7%
8. 149.0g
11. 95.3g 25.5%
12. 234.6g
15. 190.4g 33.4%
16. 131.3g
Holy Moley
1. 5.7 moles
2. 1.2 g
3. 0.08 moles
4. 135.4g
24
5. 204.2 g
6. 3.7x10 atoms
7. 53.8 moles
8. 7.8x1021 molecules
9. 1,528,239.2 or 1.5x106 moles
10. 3.2x1024 molecules 11. 2.8x1023 atoms
12. 84.8g
13. 9.6x1022 molecules
14. 32156.8g or 3.2x104g
15. 1.5x1024atoms
16. 3.9x1023 molecules
17. 3.5x106 moles
18. 3.0g
Mole Fun
1. 5.1g
2. 46.3g
3. 2.1x1024 molecules
4. 6.8x1022 molecules
5. 0.8 moles
6. 1,536,544,850 or 1.5x109 moles
7. 87.6g
8. 702.9g
9. 0.4 molecules
10. 5.5x1020 molecules
11. 2.0x1022
molecules
12. 7,757,475.1 or 7.8x106 moles
13. 2.9x1024 molecules
14. 0.1 moles
21
15. 6.5x10 moles
Lab Data Practice
2. 0.275g
3. 0.01 moles
4. 0.786g
21
6. 2.499g
8.0x10 molecules
8. 1.988g
Molar Mass, % Composition, Moles Review
1. 1.5x1024 molecules
2. 91.8g
5. 23.1%
6. 34.3%
1. 0.46g
5. 1.56g
2. 4.4x1021 atoms
6. 8.7x1021 atoms
5. 0.01 moles
3. 205.2g
3. 2.45g
7. 1.35 g
4. 0.2 moles
4. 0.014 moles