The Mole - Barrington 220 School District



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

6.02 x 1023

.

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 4.596g

Mass of aluminum after reaction 4.321g

Mass of test tube, cork, and Cu(NO3)2 8.856g

Mass of empty test tube and cork 6.357g

Mass of empty beaker 95.621g

Mass of beaker and copper 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 of beaker 53.86g

Mass of vial, cork, silver nitrate 4.36g

Mass of empty vial, cork 1.91g

Mass of copper before reaction 3.82g

Mass of copper after reaction 3.36g

Mass of silver and beaker 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 3. 71.0g 4. 18.0g, 11.1%

5. 256.8g 46.8% 6. 98.0g 3.1% 7. 151.9g 36.7% 8. 149.0g 28.2%

9. 187.5g 33.9% 10. 60.0g 40.0% 11. 95.3g 25.5% 12. 234.6g 85.5%

13. 342.3g 15.8% 14. 342.0g 42.1% 15. 190.4g 33.4% 16. 131.3g 89.3%

17. 284.0g 43.7% 18. 177.8g 66.3%

Holy Moley

1. 5.7 moles 2. 1.2 g 3. 0.08 moles 4. 135.4g

5. 204.2 g 6. 3.7x1024 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

15. 6.5x1021 moles

Lab Data Practice

2. 0.275g 3. 0.01 moles 4. 0.786g 5. 0.01 moles

6. 2.499g 8.0x1021 molecules 8. 1.988g

Molar Mass, % Composition, Moles Review

1. 1.5x1024 molecules 2. 91.8g 3. 205.2g 4. 0.2 moles

5. 23.1% 6. 34.3%

1. 0.46g 2. 4.4x1021 atoms 3. 2.45g 4. 0.014 moles

5. 1.56g 6. 8.7x1021 atoms 7. 1.35 g

Mole Conversions

GenChem

Re: 11/05 JG

MOLE FUN

Answer each of the following using the factor-label method to the correct number of significant figures.

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?

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