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Factor Label Practice
• http://www.guinnessworldrecords.com/
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 numberYou wouldn’t express the distance to
California in centimeters, you would express it in kilometers
Let’s practice
• How many H atoms are in 1 mole?
• How many molecules of CO are in 1 mol of CO?
• How many moles of sodium are in 2.9 x 10 22 atoms of sodium?
Using your calculator
• Use the EE button!– EE means ‘times 10 to the ___ power”– 1.0 EE 9 = 1.0 x 10 9
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?
• How many moles are in 1 billion atoms oflithium?
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?
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
Practice• How many hydrogen atoms are in 1
methane molecule?• How many nitrogen atoms are in 1 lead
II nitrate molecule?
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
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
• What is the GAM of – Iodine– Calcium?
Gram Molecular Mass
• What is formula for:– sulfur dioxide?– Diphosphorous
pentoxide?GMM = add up
atomic masses
Gram Formula (ionic) Mass
What is the GFM of KCl?Cu(NO3)2?
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)
Hint for homework
• Representative particle = atoms or molecules.
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)
1. How many liters of space does 1.73 mol of NH3 gas take up at STP?
1.73 mol NH3 1 mol NH3
22.4 L NH3 = 38.7 L NH3
2. How many moles of O2 are equal to 9.6 liters?
9.6 L O2
22.4 L O2
1 mol O2 = 0.43 mol O2
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?
Homework
Monday’s homework in Unit Calendar
Page 186 #24-27; Page 198 #55 a-c, 57, 59
Worksheet 7.1