Chapter 11: The Mole Table of Contents 11.1: Measuring Matter 11.2: Mass and the Mole 11.3: Moles of Compounds

Today you’ll need: -Periodic Table -Calculator -Note taking materials Measuring Matter The Mole: Basic Concepts

Practice Convert 702 cm to km 1 m702 cm1 km = km 100 cm1000 m 7.02 x km Remember:multiply by top divide by bottom

551.64Practice If an egg weighs grams, how much does a dozen eggs weigh? 12 eggs1 dz eggs45.97 g = g 1 dz eggs1 egg Remember:multiply by top divide by bottom

We use names to measure numbers: -How many roses are in a dozen? -How many rolls are in baker’s dozen? -How many gloves are in a pair? -How many sheets of paper are in a ream? -How many objects are in a mole? Measuring Matter The Mole: Basic Concepts

We use names to measure numbers: -How many roses are in a dozen? 12 -How many rolls are in baker’s dozen? 13 -How many gloves are in a pair? 2 -How many sheets of paper are in a ream? 500 -How many objects are in a mole? 6.02x10 23 The number that the unit represents is always constant Measuring Matter The Mole: Basic Concepts

1 mole = 6.02 x things = 22.4 L gas = molar mass Measuring Matter The Mole: Basic Concepts The mole (mol) is used to measure the amount of a substance. Avogadro’s number

Avagadro’s number The Mole: Basic Concepts So… how many apples are in a mole of apples? 6.02x10 23 apples are in a mole of apples. So… how many water molecules are in a mole? 6.02x10 23 water molecules are in a mole. 6.02x10 23 particles 1 mol

Volume of gas The Mole: Basic Concepts So… what is the volume of one mole of hydrogen gas? 22.4 L hydrogen gas So… how many moles is 22.4 L of CO 2 gas? 1 mole CO L gas 1 mol gas

Do a dozen eggs weigh the same as a dozen feathers? The Mass of a Mole Nope! Does a mole of one element weigh the same as a mole of a different element? The Mole: Basic Concepts Nope!

The Mass of a Mole Molar mass: The mass in grams of one mole of any pure substance. The Mole: Basic Concepts molar mass = atomic mass (g) 1 mol

The Mass of a Mole Carbon. Atomic mass: amu Molar mass: g/mol Manganese Atomic mass: amu Molar mass: g/mol The Mole: Basic Concepts

Molar mass of a compound Molar mass of a compound: the mass of a mole of the compound. The Mole: Basic Concepts Molar mass of NH 3 = molar mass of N + 3(molar mass of H) Molar mass of NH 3 = g/mol + 3(1.008 g/mol) = g/mol

Practice: Finding Molar Mass Find the molar mass of the following: NaOH C 2 H 5 OH Sr(NO 3 ) 2 (NH 4 ) 3 PO g/mol NaOH g/mol C 2 H 5 OH g/mol Sr(NO 3 ) g/mol (NH 4 ) 3 PO 4

25.0 Examples g Ca0.625 mol Ca = g Ca 1 mol Ca Calculate the mass of moles of calcium. Use molar mass to convert mol to g Molar mass as a conversion factor

13.3 Examples 1 mole Cu848 g Cu = mol Cu g Cu A roll of copper wire has a mass of 848 g. How many moles of copper are in the roll? Use molar mass to convert g to mol Molar mass as a conversion factor

g (C 3 H 5 ) 2 S Moles of a compound to Mass The Mole: Basic Concepts 2.50 mol (C 3 H 5 ) 2 S 1 mol (C 3 H 5 ) 2 S Use molar mass to convert mol to g Example: What is the mass of 2.50 moles of (C 3 H 5 ) 2 S ? = g (C 3 H 5 )S Molar Mass: g/mol (C 3 H 5 ) 2 S

1 mol H 2 O g H 2 O Converting Mass of a Compound to Moles The Mole: Basic Concepts kg H 2 O 1 kg H 2 O 1000 g H 2 O = mol H 2 O Convert kg to g Use molar mass to convert g to mol = mol H 2 O How many moles of water are in kg of water? Molar Mass: g/mol H 2 O

Practice Convert to moles: 1) 25.5 g Ag 2) g S 3) 319 g H 2 SO mol Ag mol S 3.25 mol H 2 SO 4 Convert to grams: 4) 3.57 mol Al 5) 42.6 mol Si 6) 4.35x10 -2 mol ZnCl g Al 1.2x10 3 g Si 5.93 g ZnCl 2

Your turn! We will correct this worksheet on Wednesday at the beginning of class. Show your work on page 2!

Chapter 11: The Mole Table of Contents 11.3: Moles of Compounds

Moles of Compounds 1 mole of ammonia (NH 3 ) consists of: 1 mole of N atoms 3 moles of H atoms The Mole: Basic Concepts ratio : 1:3 1 mole of baking soda (NaHCO 3 ) consists of: 1 mole of Na atoms 1 moles of H atoms 1 moles C atoms 3 moles O atoms ratio : 1:1:1:3

Moles of Compounds In some calculations, you may need to convert moles of a compound to individual atoms in the compound. Freon : CCl 2 F 2 ratio 1:2:2 The Mole: Basic Concepts Conversion factors 1 mol C atoms 2 mol Cl atoms 2 mol F atoms 1 mol CCl 2 F 2 1 mol CCl 2 F 2 1 mol CCl 2 F 2

Moles of Compounds Example: How many moles of fluorine atoms are in 5.50 moles of Freon (CCl 2 F 2 )? 5.50 mol CCl 2 F 2 2 mol F atoms 1 mol CCl 2 F 2 The Mole: Basic Concepts = 11.0 mol F atoms

Practice: Determine the number of chloride ions in 2.50 mol ZnCl 2 Calculate the number of moles of sulfate ions in 3.00 mol (Fe 2 (SO 4 ) 3 ) mol Cl mol SO 4 2-