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1)0.00045 2)3.4 x 10 -5 3)0.001 4)5.6 x 10 3 Remembering Scientific Notation…..

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Main unit in chemistry we will use ! ! ! Describes the amount of atoms in a particular substance 1 mole = 6.02 x 10 23 atoms (KNOW THIS CONVERSION) 1 mole = formula mass (g) of a compound = atomic mass (g) of an element = 22.4 L of a solution under STP The MOLEThe MOLE

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Example 1: CarbonExample 1: Carbon

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Example 2: AluminumExample 2: Aluminum

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= mass of 1 mole of a substance Units = grams/mole or g/mol Molar MassMolar Mass

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1 mole = 6.02 x 10 23 atoms “Avogadro’s number” How many atoms are in 1 mole?

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How many atoms are in 1 mole of Mg? Example 1Example 1

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How many atoms are in 1 mole of C? Example 2:Example 2:

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Remember….. 1 mole = 6.02 x 10 23 atoms of element/molecules of chemical compound Atomic mass of element Formula mass of a compound

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Example 1:Example 1: 2 moles Carbon grams

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Example 2:Example 2: Calcium has a mass of 10.0g. How many moles of Calcium? Atoms?

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Example 3:Example 3: 86.2 grams C 2 H 4. How many moles of C 2 H 4 ? How many molecules?

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Example 4:Example 4: 1.26 moles of NbI 5. How many grams?

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Example 5:Example 5: 5 grams of H 2 O to molecules of H 2 O

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Practice Mole Conversion Worksheet

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