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1
The Mole Chapter 11

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Measuring Matter Section 11.1

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How much is a mole? Count large # of items is easier when you use counting units like the dozen Chemists use a counting unit called the mole

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**How is a mole used in chemistry?**

Mole (mol) is SI base unit used to measure amount of substance 1 mole = Avogadro’s # = x 1023 RP Representative particles (RP) = atoms = molecules = FU = electrons = ions

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**Relate a mole to common counting units**

1 dozen eggs = 12 eggs 1 pair of shoes = 2 shoes 1 ream of paper = 500 sheets of paper 1 lb of sugar = 16 ounces of sugar 1 Liter of HCl = 1000 mL of HCl

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**1 Mole of Representative Particle (RP)**

Molecule of water Atom of Cu FU of NaCl

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**How many roses are in 3 ½ dozens?**

Conversion factor: 12 roses/1 dozen 3.5 dozen x 12 roses/1 dozen = 42 roses

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Convert moles # RP ? RP = given moles x 6.02 x 1023 RP 1 mole

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**Example ? mole = given RP x 1 mole 6.02 x 1023 RP**

= 2.65 x 1024 FU ZnCl2 x 1 mole ZnCl2 6.02 x 1023 FU ZnCl2 = 4.40 moles ZnCl2

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Convert # RP moles ? mole = given RP x 1 mole 6.02 x RP

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**Conversion factor: 6.02 x 1023 RP/ 1 mol**

Example Conversion factor: 6.02 x 1023 RP/ 1 mol ? RP = given moles x 6.02 x RP 1 mole = 3.5 moles sucrose x 6.02 x 1023 molecules sucrose 1 mole sucrose =2.11 x 1024 molecules sucrose

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**Practice Determine the # of atoms in 2.50 mol Zn. 1.51 x 1024 atoms Zn**

Given 3.25 mol AgNO3, determine # FU 1.96 x 1024 formula units AgNO3 Calculate # molecules in 11.5 mol H2O 6.92 x 1024 molecules H2O

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**More Practice How many moles contain 5.75 x 1024 atoms of Al?**

9.55 mol Al How many moles contain 3.75 x 1024 molecules CO2? 6.23 mol CO2 How many moles contain 3.58 x 1023 formula units ZnCl2? 0.595 mol ZnCl2

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Homework p from textbook 1-4 10 Due tomorrow

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Mass and the Mole Section 11.2

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**Relate the mass of an atom to the mass of a mole of atoms**

1 dozen eggs and 1 dozen limes are not equal masses Why? Because they are different compositions and size

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**Avogadro’s Number 6.022 x 1024 Representative Particles**

ions, atoms, molecules, electrons, FU Lorenzo Romano Amedeo Carlo Avogadro, conte di Quaregna e di Cerreto ( ) Photo from

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**Mole to Atom? 1 mole = 6.022 x 1024 atoms**

1 mole = x 1024 molecules 1 mole = x 1024 ions 1 mole = x 1024 electrons 1 mole = x 1024 Formula Units (FU)

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Calculate mole grams ? Grams = given moles x grams from PT 1 mole

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**Calculate the mass of an element when given # of atoms of element**

? grams = atoms x 1 mol x g from PT 6.02 x 1023atoms mol

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**Calculate # of atoms of element when given mass of element**

? Atoms = grams x 1 mol x 6.02 x 1023atoms g from PT mol

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Homework Pages (12-14) from the textbook Due tomorrow

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Moles of Compounds Section 11.3

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**Recognize the mole relationship shown by a chemical formula**

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**Calculate the molar mass of a compound**

Add the atomic masses from the periodic table together Ex: Find the molar mass for MgCl2 Molar mass = massMg + 2 (massCl) = g + 2( g) = g g = g MgCl2

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**Calculate # moles of compound from given mass of compound**

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**Calculate mass of compound from given # moles of compound**

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**Determine # atoms or ions in a mass of a compound**

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**Empirical & Molecular Formulas**

Section 11.4

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**Explain what is meant by the % composition of a compound**

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**Determine the empirical & molecular formulas for compound from mass % & actual mass data**

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**The formula for a hydrate**

Section 11.5

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What is a hydrate?

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**How does its name reflects its composition?**

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**Determine the formula for a hydrate from laboratory data**

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