1)0.00045 2)3.4 x 10 -5 3)0.001 4)5.6 x 10 3 remembering scientific notation…
TRANSCRIPT
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1) 0.00045
2) 3.4 x 10-5
3) 0.001
4) 5.6 x 103
Remembering Scientific Notation…..
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The Mole
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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 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
The MOLE
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Example 1: Carbon
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Example 2: Aluminum
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= mass of 1 mole of a substance
Units = grams/mole or g/mol
Molar Mass
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1 mole = 6.02 x 1023 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 1
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How many atoms are in 1 mole of C?
Example 2:
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MOLE CONVERSIONS
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Remember…..
1 mole = 6.02 x 1023 atoms of
element/molecules of chemical compound
Atomic mass of element Formula mass of a compound
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Example 1:
2 moles Carbon grams
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Example 2:
Calcium has a mass of 10.0g. How many moles of Calcium? Atoms?
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Example 3:
86.2 grams C2H4. How many moles of C2H4? How many molecules?
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Example 4:
1.26 moles of NbI5. How many grams?
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Example 5:
5 grams of H2O to molecules of H2O
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Practice
Mole Conversion Worksheet