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