Mole-o-ramaChapter 3.4
Objectives
• Why did you have to have 602 beans in your mole?
• Weighing to count• What is a mole?
Count
• Option 1: Count 602 beans• Option 2: Say you counted• Option 3: Mass a bean
» Multiply by 602» Collect that mass of beans!
Even better…
• Beans are different…• Use average value• Mass 10 beans …
• Divide by 10 = average
More beans…
6.0 g8.0 g5.0 g4.0 g5.0 g
ABCDE
Average bean here is 5.6 g
602 bean B = 4800 grams
602 bean D = 2400 grams
602 average = 3400 grams
Use averages!!
Periodic Table Isotope Isotope
Average Atomic Mass:
•Average mass of all atoms of an element
•Found on periodic tables everywhere
http://www.chem.wisc.edu/areas/reich/handouts/periodic-table.GIF
http://img.photobucket.com/albums/v623/johnnysilver/etc/chineseperiodictable.gif
What is the average?
35 Cl
36
37 Cl
What is the average?
35 Cl
35.6
37 Cl35 Cl
What is the average?
35 Cl
35.5
37 Cl35 Cl 35 Cl
Use averages!!
Periodic Table Isotope Isotope
35.45 is the average atomic mass of Cl
Back to the beans…
• If we had a dozen beans… what would they weigh?
12 beans 5.6 g
1 bean = 67 grams
Back to the beans…
• If we had a dozen bean burritos*… what would they weigh?
12 burritos 440 g
1 burrito = 5280 grams
http://www.bajafresh.com/burritos.php
*Bean burrito is not pictured due to boring-ness … this is the Baja Fresh Baja Burrito…
Molé
Tasty sauce for burritos, etc.
http://www.lasanitas.com/ourmenu/images/apic7big.jpg
Mole
http://www.cohenufo.org/Images.GIF/Mole.jpg
Mole
• Aside from being a small rodent and fun project…
http://snigglezone.com/images/mole1.jpg http://mrskingsbioweb.com/moleday.JPG
Avogadro’s Number … the Mole!
• The Mole is a counting number• Chemist’s Dozen
6.02 x 10 23 things
If we had a mole of beans…
• It would have the mass of 3 billion billion CVN 76’s
By the way
• Enough aircraft carriers (which are about 3 ½ football fields long) to reach the sun and back almost 4 BILLION times
Why do we need the mole?
• This paperclip is 1.18 g
• 23 of them have 1 mole of Al atoms
6.02 x 10 23 atoms
Next time…
The name is Mole.James Mole.
http://k9zw.files.wordpress.com/2007/10/moles_are_forever.jpg