Warm Up12-1-16

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Warm Up 12-1-16

1. Which atom did Avogadro based his experiment on?
2. How many molecules are in 1 mol of oxygen gas?
3. The molar mass of 1 CO2 compound is ___
4. Define sophmole.

Homework Dec 6 - Online HWDec 7 - Test Unit
5 Dec 7 - Deadline to retake quizzes and turn in
absent work
Agenda Go over quizNotes Unit 5-5WS 5-5
practiceTurn in mole poster
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(No Transcript)
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Quiz Answers

• Version Batman
• 1. Odor, light, temp.2. 2Al Fe2O3 ?
• 2Fe Al2O3
• 3. 8
• 4. Decomposition
• 5. Na2OH - cant put coefficient in the middle of
  a compound

• Version Superman
• 1. Odor, light, temp.2. 2NaCl MgBr2 ?
• MgCl2 2NaBr
• 3. 32
• 4. Combination/synthesis
• 5. Na2OH - cant put coefficient in the middle of
  a compound

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Notes Unit 5-5Moles Conversion
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Bubble Diagram

• Using moles to convert between mass and the
  amount of atoms in a compound

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Conversion Types

1. Moles to grams
2. Moles to atoms/molecules
3. Grams to moles
4. Atoms/molecules to moles
5. Grams to atoms
6. Atoms to grams

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Mole to Gram Conversions

• 1) What is the mass of 2.5 moles of phosphorus?

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Mole to Gram Conversions

• Multiple the of moles given by the molar mass
• Example What is the mass of 2.5 moles of
  phosphorus?
• Molar mass30.97 g/mol

moles A ? grams A
Molar mass (from periodic table)
2.5 mol P 30.97 g P 2.5 x 30.97 g P 77 g P
1 mol P 1 77 g P
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Mole to Atoms

• 2) How many atoms are in 3.00 moles of Na?

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Mole to Atoms

• Multiple the of moles given by Avogadros
  number
• Example How many atoms are in 3.00 moles of Na?

moles A ? atoms A
Avogadros Number (6.02 x 1023 particles/mol)
3.00 mol Na 6.02 x 1023 atoms Na 3.00 x (6.02 x 1023) atoms Na 1.81 x 1024 atoms Na
1 mol Na 1 1.81 x 1024 atoms Na
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Gram to Mole Conversions

• 3) How many moles are in 12 grams of FeO?

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Gram to Mole Conversions

• Multiply the of grams given by the inverse of
  the molar mass.
• Example How many moles of iron are in 12 grams
  of iron?

grams A ? moles A
Molar mass (from periodic table)
12 g Fe 1 mol FeO 12 mol Fe 0.169 moles Fe
71.85 g Fe 71.85 0.169 moles Fe
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Atoms to Moles

• 4) If you have 7.45 x 1025 molecules of O2 gas,
  how many moles do you have?

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Atoms to Moles

• Multiple the of moles given by the inverse of
  Avogadros number
• Example If you have 7.45 x 1024 molecules of Cu,
  how many moles do you have?

atoms A ? moles A
Avogadros Number (6.02 x 1023 particles/mol)
7.45 x 1025 molecules Cu 1 mol Cu 7.45 x 1025 mol Cu 124 mol Cu
6.02 x 1023 molecules Cu 6.02 x 1023 124 mol Cu
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Grams to Atoms

• 5) How many atoms are in 26 grams of cobalt?

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Grams to Moles to Atoms
Grams A ? moles A ? molecules A
Avogadros Number (6.02 x 1023 particles/mol)
Molar mass (from periodic table)

• 2 steps! 1st multiply by the inverse of the
  molar mass, 2nd multiply by Avogadros number
• Example How many atoms are in 26 grams of cobalt?

26 g Co 1 mol Co 6.02 x 1023 molecules Co 2.7 x 1023 molecules Co
58.93 g Co 1 mol Co 2.7 x 1023 molecules Co
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Atoms to Grams

• 6) What is the mass of 8.60 x 1023 atoms of NaCl?

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Atoms to Moles to Grams
molecules A ? moles A ? Grams A
Avogadros Number (6.02 x 1023 particles/mol)
Molar mass (from periodic table)

• 2 steps! 1st multiply by the molar mass, 2nd
  multiply by the inverse of Avogadros number
• Example What is the mass of 8.60 x 1023
  molecules of As?

8.60 x 1023 molecules As 1 mol As 74.92 g As 107 g As
6.02 x 1023 molecules As 1 mol As 107 g As
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Assignments

• Summary explain the bubble diagram and how to
  use it.
• WS 5-5 due next class (check answers my website)

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Group work

• Work on questions 1-9 with a partner

ANSWERS 1) 1 x 103 2) 7.16 x 10-3 3) 1.67 x
10-4 4) 4.454 x 1024 5) 2.53 x 1021 6) 3.01 x
1024 7) 96 grams 8) 5.778 x 10-2 9) 722.16 grams