2. Dr. Chin Chu

3. Alternative Counting Units 1 pair = 2 1 dozen = 12

4. Alternative Counting Units 1 baker’s dozen = 13 1 US bushel ≈ 35.2 L http://www.unc.edu/~rowlett/units/scales/ bushels.html

5. Alternative Counting Units 1 fluid barrel ≈ 119.2 L

6. Alternative Counting Unit for Chemistry As the size of the particles decreases, number of particles increases to get a sample that is tangible. http://htwins.net/scale2/?bordercolo r=white

7. T HE MOLE The mole concept is no different from other alternative counting units. 1 mole (A) = 6.022 x10 23 particles of (A) 6.022 x 10 23 particles (A) 1 mole (A) = 1 6.022 x 10 23 particles (A) 1 mole (A) = 1 The number is so big is due to the extremely small sizes of molecules, ions and atoms.

8. One mole of paper would make a stack that would reach to the moon more than 80 billion times. One mole of grains of sand would be more than all of the sand on Miami Beach. One mole of blood cells would be more than the total number of blood cells found in every human on earth. A one liter bottle of water contains 55.5 moles of water. There are 3 types of moles that live underground in North America: Eastern Mole, Hairy-Tailed Mole and Star-Nosed Mole. One mole of inches would be1,616,434 light years, or across our galaxy and back 8 times. One mole of seconds is about 19 quadrillion years, 4,240,666 times the age of the earth, or 954,150 times the age of the universe itself! One mole of cents could repay the United States National Debt 86 million times. Amazing Mole Facts:

9. 6.022 x 10 23 molecules (H 2 ) 1 mole (H 2 ) MOLE-P ARTICLES EXAMPLE 1 Finish the math. 0.456 mol. (H 2 ) = = 2.75 x 10 23 molecules (H 2 ) Bravo! Mission accomplished. Q - How many hydrogen molecules are there in 0.456 moles of hydrogen gas? 0.456 mol. (H 2 ) x

10. If you are really good at this, an equivalent but simpler protocol could be used. THE MONKEY BAR: 0.456 mol. (H 2 ) = 0.456 mol. (H 2 ) mole (H 2 ) = 2.75 x 10 23 molecules (H 2 ) 6.022 x 10 23 molecules (H 2 ) 1 MOLE-P ARTICLES EXAMPLE 1

11. molecules (H 2 O) Use the factor-labeling approach. Let the units guide the math. 7.83x10 24 molecules (H 2 O) mole (H 2 O) = 1.30 x 10 1 molecules (H 2 O) 6.022 x 10 23 1 MOLE-P ARTICLES EXAMPLE 2 Q - How many moles of water in 7.83 x 10 24 molecules of water? 7.83x10 24 molecules (H 2 O) =

12. The End