Factor Label Practice

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Factor Label Practice

• http//www.guinnessworldrecords.com/

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The Mol

• Just another unit of measurement
• In one mole of atoms or molecules, there are
  6.022 x 10 23 atoms or molecules (HCl or S)
• Just like in one dozen eggs, there are 12 eggs.
• Atoms and molecules are EXTREMELY small, that is
  why the mol is such a BIG number
• The mol makes it easier to represent such a large
  number
• You wouldnt express the distance to California
  in centimeters, you would express it in
  kilometers

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Lets practice

• How many H atoms are in 1 mole?

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• How many molecules of CO are in 1 mol of CO?

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• How many moles of sodium are in
• 2.9 x 10 22 atoms of sodium?

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Using your calculator

• Use the EE button!
• EE means times 10 to the ___ power
• 1.0 EE 9 1.0 x 10 9

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More practice

• How many sodium atoms are in 2.5 moles of sodium?
• How many molecules of carbon dioxide are in 0.5
  moles of carbon dioxide? How many atoms is this?

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• How many moles are
• in 1 billion atoms of
• lithium?

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More practice

• How many atoms are in 3.0 moles of osmium?
• How many molecules of sulfur monoxide are in .75
  moles?
• How many moles are in 2.3 x 10 24 atoms of Cu?

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Molecules and atoms

• How many oxygen atoms are in 1 molecule of O2?
• How many hydrogen atoms are in 1 molecule of
  C3H8? How many carbon atoms are present?
• To go from molecules to atoms? count how many of
  each atom are in the molecule

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Practice

• How many hydrogen atoms are in 1 methane
  molecule?
• How many nitrogen atoms are in 1 lead II nitrate
  molecule?

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Molar Mass

• This is also known as gram atomic mass (for an
  atom), gram formula mass (for an ionic compound)
  and gram molecular mass
• The mass of 1 mole of an atom or a molecule

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Gram atomic mass

• The mass (g) of 1 mole of an atom ? Use the
  periodic table
• GAM of
• carbon is 12.0 g
• oxygen is 16.0 g
• Go to the 10ths

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• What is the GAM of
• Iodine
• Calcium?

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Gram Molecular Mass

• What is formula for
• sulfur dioxide?
• Diphosphorous pentoxide?
• GMM add up atomic masses

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Gram Formula (ionic) Mass

• What is the GFM of KCl?
• Cu(NO3)2?

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QUIZ Please do on a half a sheet of paper

1. How many grams of water are in 2.0 mols of water?
2. How many moles of Mg is 1.25 x 10 23 atoms of Mg?
   How many grams is this?
3. How many atoms are in 2.8 x 10 24 molecules of
   SiO2? How many grams is this?
4. How many liters does 8.5 grams of oxygen gas
   occupy? (Assume STP)

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Hint for homework

• Representative particle atoms or molecules.

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Mole / Volume Relationship
1 mol of gas at STP 22.4 Liters STP Standard
Temperature and Pressure
Standard Temp 0 oC Standard Pressure 101.3
kPa (kiloPascals) or 1.0 atm (atmospheres)
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1. How many liters of space does 1.73 mol of NH3
gas take up at STP?
1.73 mol NH3
22.4 L NH3
38.7 L NH3
1 mol NH3
2. How many moles of O2 are equal to 9.6 liters?
9.6 L O2
1 mol O2
0.43 mol O2
22.4 L O2
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Practice for test

• Collect 2.0 moles of water. How many mL is this?
• Collect 0.75 moles of potassium sulfate.
• Collect 8.0 x 10 24 molecules of barium chloride.
• Collect 3.0 x 10 23 atoms of aluminum.
• Collect 2.0 grams of sodium chloride. How many
  moles is this? How many molecules?

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Homework
Mondays homework in Unit Calendar Page 186
24-27 Page 198 55 a-c, 57, 59 Worksheet 7.1