1. Avogadro's Number 6.02 x 1023 Presented by Elizabeth Sterling
Brittany Thompson

2. Directions
To navigate through this tutorial, click anywhere on the slide.
If you need to return to a previous slide, right click and select previous, until you reach the desired page. 

3. What is Avogadro’s Number?
Avogadro’s Number is a very large number.
The number is so large it is difficult to comprehend.

4. How big is it?
An Avogadro's number of standard soft drink cans would cover the surface of the earth to a depth of over 200 miles.
If you had Avogadro's number of un-popped popcorn kernels, and spread them across the United States of America, the country would be covered in popcorn to a depth of over 9 miles.
If we were able to count atoms at the rate of 10 million per second, it would take about 2 billion years to count the atoms in one mole.

5. The More Accurate #
The long version of Avogadro’s Number is 6.022 141 99 x 1023 mol-1 atoms per mol
The more common, and shorter, form of the number is 6.02 x 1023

6. What is Avogadro’s Number?
Avogadro’s Number is the number of particles in a mole of a given substance
Particles can mean atoms or molecules.

7. Avogadro’s number does not have a specific unit.
Avogadro’s number is just a number that explains how much of something, such as atoms or molecules, is in one mole of an element.

8. Definitions Just in case you didn’t know:
Atom: A chemical unit, composed of protons, neutrons, and electrons, that cannot further break down by chemical means.
Mass: The average weight of an atom
Element: A pure substance composed of only one type of atom. It is any substance that cannot be broken down to any other substance.

9. How Did This Number Come To Exist?
Chemists discovered atomic weights
Atomic weights are the average mass of an element
For Example:
Na and Cl combine on a 1:1 ratio by atom
Na and Cl combine on a 23 gram to 35.5 gram ratio by mass
1:1
23:35.5

10. How Did This Number Come To Exist? Cont.
Chemists decided to take the Atomic Weight of one element, and make it equal to one mole.
For example
1 atom of Hydrogen = 1 mole
14 atoms of Nitrogen = 1 mole
32 atoms of Sulfur = 1 mole
So, no matter what element or how many atoms are within that element, it will always equal 1 mole

11. How Did This Number Come To Exist? Cont.
Finally the chemists measured how many atoms are in just one mole.
It comes out to be the number x 1023 atoms.
Therefore 1 mole of substance = x 1023 particles.
This is called Avogadro's number.

12. How to use it To find the amount of grams in an element:
How many grams are in 3.56 x 1022 atoms of Ca
The mass of Ca is grams
Let’s see how it’s solved! 

13. What just happened? Avogadro’s Number is in pink
Take the amount of atoms given
To change from atoms to grams (what you are trying to get) you need to divide by the same units
So, you need to divide the number of atoms by Avogadro’s Number (whose units are atoms, shown in red)

14. Cont.
When you divide the atoms, the atoms cancel each other out, and leave you with grams (which are in blue!)
In grams of Calcium, there are 6.02 X 1023 atoms
So, to figure out how many grams are in 3.56 X 1022 atoms of Calcium, you need to multiply the given amount (3.56 X 1022 atoms) by the known information of Calcium (40.08 grams) over Avogadro’s Number (6.02 X 1023 atoms)

15. Instructions for Quiz Note
You will need a calculator and possibly a pencil and paper.
Only click on the blue boxes that contain the possible answers or instructions. If you click anywhere else, it will take you to an incorrect slide.
If you get lost, hit the left directional arrow button until you reach the desired slide.

16. Quiz! Question #1 Who came up with Avogadro’s number? A. Hanson
B. Dr. House
C. Avogadro
D. Mr. Wolfe

17. WRONG ANSWER
Try Again
Try Again!

18. Click here for next question
CORRECT
CONGRATULATIONS!
The answer is Avogadro.
Click here for next question

19. Quiz Question #2 How many atoms does 0.450 mole of Fe contain?
A x 10 23
B x 10 23
C x 10 23
D x 10 25

20. Click here to go to next question
CORRECT
CONGRATULATIONS!
How many atoms does mole of Fe contain?
The answer is x 10 23
Click here to go to next question

21. Quiz
Question #3
How many moles of nickel atoms are there in 80 nickel atoms?
A x
B x 10 22
C x
D x

22. Click here to go to next question
CORRECT
CONGRATULATIONS!
How many moles of nickel atoms are there in 80 nickel atoms?
The answer is 1.33 x
Atoms must go on the bottom in order to cancel out the atoms and be left with moles
Click here to go to next question

23. Quiz Question #4 How many molecules does 0.200 gram of H2O contain?
*NOTE*
H2O = 18 grams / mole
A x 10 17
B x 10 22
C x 10 21
D x 10 22

24. Click here to go to next slide
CORRECT
CONGRATULATIONS!
How many molecules does gram of H2O contain?
The answer is 6.68 x 10 21
First you need to find the moles by dividing the grams given by the grams in water
Moles must go on the bottom in order to cancel out the moles and be left with atoms
Click here to go to next slide

25. CONGRATULATIONS!
You are done and have completed this quiz and tutorial! WAY TO GO!

Click anywhere on this slide to go onto the Works Cited page.

26. Works Cited http://www.bulldog.u-net.com/avogadro/avoga.html