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Page 1: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms
Page 2: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms
Page 3: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms

Using Mass to Count Things

• Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter

• We use massmass to “count” atoms

Page 4: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms

Counting by mass

• a pile of nails weighs 1227 g

• one nail has mass of 0.450 grams

• How many nails are in pile?

1227g_____ = 2726.6 nails 0.450 g per nail

Page 5: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms

What is a mole?

No, not this kind of mole!

http://news.bbc.co.uk/olmedia/1790000/images/_1794077_mole300.jpg
http://www.bird-x.com/products/images/moleBig.jpg
Page 6: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms

The MOLE

• Unit used to “count” numbers of atoms– Count-by-mass technique

• Defined as # of atoms in 12.0 grams of C-12 – This is the STANDARD!

• 12.0 g of C-12 has 6.0221415 X 1023 atoms

Page 7: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms

Just how big is a mole?

Mole movie

http://www.youtube.com/watch?v=1R7NiIum2TI
Page 8: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms

The MOLE

• 1 mole of any element has 6.02 X 1023 particles

• This is a really big number – It’s so big because atoms are really small!

Page 9: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms

6.02 X 1023 = Avogadro’s Number

• One mole of water = 6.02 X 1023 water molecules

• One mole of gorillas = 6.02 X 1023 gorillas

• One mole of He atoms = 6.02 X 1023 He atoms

• One mole of anything = 6.02 X 1023 of that thing

Page 10: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms

Similar Words

• PairPair: 1 pair shoelaces = 2 shoelaces

• DozenDozen: 1 dozen oranges = 12 oranges

• GrossGross: 1 gross spider rings = 144 rings

• ReamReam: 1 ream paper = 500 sheets of paper

• MoleMole: 1 mole Na atoms

= 6.02 X 1023 Na atoms

Page 11: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms
Page 12: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms

Equalities

• 1 mole of C-12

=

• 12.0 grams of C-12

=

• 6.02 X 1023 atoms of C-12

• 0.5 mole of C-12

=

• 6.0 grams of C-12

=

• 3.01 X 1023 atoms of C-12

Page 13: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms

Equalities

• 1 mole of C-12

=

• 12.0 grams of C-12

=

• 6.02 X 1023 atoms of C-12

• 0.25 mole of C-12

=

• 3.0 grams of C-12

=

• 1.50 X 1023 atoms of C-12

Page 14: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms

Equalities

• 1 mole of C-12

=

• 12.0 grams of C-12 =

• 6.02 X 1023 atoms of C-12

• 2 moles of C-12

=

• 24.0 grams of C-12

=

• 12.04 X 1023 atoms of C-12 = 1.204 X 1024 atoms of C-12

How does this help with other elements?How does this help with other elements?

Page 15: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms

Molar mass for any element:

• molar mass of any element:– take atomic mass and replace a.m.u. with grams

• 1 mole Ne = 20.179 g = 6.02 X 1023 atoms

• 1 mole Ar = 39.948 g = 6.02 X 1023 atoms

• 1 mole Kr = 83.80 g = 6.02 X 1023 atoms

Page 16: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms

sliding scale of size

How small?

http://htwins.net/scale2/
http://ed.ted.com/lessons/just-how-small-is-an-atom

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