Remembering Scientific Notation…..

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Presentation transcript:

Remembering Scientific Notation….. 0.00045 3.4 x 10-5 0.001 5.6 x 103

The Mole

The MOLE Main unit in chemistry we will use ! ! ! Describes the amount of atoms in a particular substance 1 mole = 6.02 x 1023 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

Example 1: Carbon 1 mole = 12.011 grams

Example 2: Aluminum 1 mole = 26.982 grams

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

How many atoms are in 1 mole? 1 mole = 6.02 x 1023 atoms “Avogadro’s number”

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

MOLE CONVERSIONS

Remember….. 1 mole = 6.02 x 1023 atoms of element/molecules of chemical compound Atomic mass of element Formula mass of a compound

3 types of problems Grams to moles, Moles to grams Atoms to moles, Moles to atoms Grams to atoms, Atoms to grams

Example 1: 2 moles Carbon grams 24g C

Calcium has a mass of 10.0g. How many moles of Calcium? Atoms? Example 2: Calcium has a mass of 10.0g. How many moles of Calcium? Atoms? 0.25 mole Ca 1.5 x 1023 atoms Ca

86.2 grams C2H4. How many moles of C2H4? How many molecules? Example 3: 86.2 grams C2H4. How many moles of C2H4? How many molecules? 3.08 moles C2H4 1.85 x 1024 molecules C2H4

1.26 moles of NbI5. How many grams? Example 4: 1.26 moles of NbI5. How many grams? 917.28 g NbI5

5 grams of H2O to molecules of H2O Example 5: 5 grams of H2O to molecules of H2O 1.67 x 1023 molecules H2O

Practice Mole Conversion Worksheet