Catalyst 1. How many moles are in 42 g of NaOH 2. How many grams are in 2 moles of HBr End

Catalyst1. How many moles are in 42 g of

NaOH2. How many grams are in 2 moles

of HBr

End

Stop and Jot

• Homer eats 15 dozen doughnuts. How many doughnuts did he eat?

Lecture 3.7 – Moles to Particles

Today’s Learning Targets

• LT 3.9 – Given an element, I can convert between the number of moles to particles and particles back to moles

How do we convert between moles and particles?

Grams of Substance A

Moles A

Our Focus for Today

How do we go from moles to particles? Particle

s of A

I. The Importance of Avogadro’s Number

• Avogadro’s number tells us that there are 6.022 x 1023 particles in 1 mole of anything.

• Therefore, Avogadro’s number is used as our conversion factor between moles and particles of a substance.

II. Moles Particles Conversion Factor

• Our conversion factor for moles particles is:

6.022 x 1023 particles

mole

Can be reversed to fit conversion

Class Example

• You react 3 moles of HCl for the following reaction. How many molecules of HCl did you use for this reaction?

Table Talk

• If you react 4 moles of MnO2, how many particles of MnO2 did you use in this reaction?

• If you react 25 g of MnO2. How many particles of MnO2 did you use in this reaction?

GAME TIME

• If you react 24 x 1023 particles of MnO2. How many moles of MnO2 did you use in this reaction?

SUMMARIZE

The Amazing Race• There are 8 different clues that you and your

teammate will be given.• These clues are around the room and will require

you to solve various stoichiometry problems.• There are different types of problems that you

will face and difficulty of the stoichiometry problem depends on the portion of the race that you are on

• You must check your answers with me before moving on!

Detour• You will have to choose between two stoichiometry problems before you start working on them. • You must decide on the one you want to solve before beginning

Roadblock• Before beginning you must decide on one person to solve the problem. • You cannot help the person

Fast Forward• An intense stoich. problem that if you get it right will jump you to the end of the race. Can only be completed at Stop 6.

Yield• At multiple points in the race there will be yield signs.• At one point you can have a group behind you stop and wait 3 min. The team must be behind you and you must give me your yield card

Prizes

• 1st Place Team – Homework pass for each student

• 2nd Place Team – Flamin’ Hot Cheetos• 3rd Place Team – Candy

Your Route

Stop 1 – New York City

Question 1• Both Partners should complete this problem

• You are about to start the race in New York City. You want to make sure you stay hydrated so you go to the drinking fountain and drink 126 g of H2O. How many moles of H2O did you just drink?

• Show Mr. Astor once you have finished the problem.

Stop 2 – Mexico City

Question 2

•Detour – Before beginning your calculations you must decide whether you want to do problem 1 or 2. You cannot do the other problem once you have begun. Both Partners should complete this problem

Question 2

•1. Welcome to Algeria! Algeria produces a large amount of NaCl from its salt mines. You get off the plane and you sprinkle 6 moles of NaCl on your food. How much NaCl did you just put on your food? •Show Mr. Astor the answer when you finish.

•2. Welcome to Algeria! Algerians love their sugary foods. You eat 1,080 g of C6H12O6 after you get off the plane. How many moles of sugar did you just eat?•Show Mr. Astor the answer when you are complete.

Stop 3 – Peru

Question 3• Roadblock – Only one partner can complete this problem.

The other partner cannot help with the problem until the right answer is achieved.

• Hint – Libya is a rather explosive place

• Libya has been through a lot lately. A lot of TNT has been going off. TNT is also known as C7H5N3O6. If you have 5 moles of C7H5N3O6, then how many grams of N2will you produce in this reaction?

Stop 4 – Rio de Janeiro

Question 4• Question 4

• Both Partners should complete this problem

• Welcome to Egypt! The Ancient Egyptians are credited with inventing the process by which we can make paper. A common chemical that is used in today’s paper making industry is Na2CO3. If I have 530 g of Na2CO3, then how many particles of Na2CO3 do I have?

Stop 5 – South Africa

Question 5• Question 5

• Detour – Before beginning your calculations you must decide whether you want to do problem 1 or 2. You cannot do the other problem once you have begun. Both Partners should complete this problem

Question 5• 1. Welcome to India! Indian food is often characterized by

its use of curry and many other spices. While this food is very good, often times it makes your stomach feel terrible. In order to fix a stomach ache, many people drink milk of magnesia or Mg(OH)2. If I drink 58 g of Mg(OH)2, then how many particles of Mg(OH)2 did I drink?

• 2. Welcome to India! Indian food is often characterized by its use of curry and many other spices. While this food is very good, often times it makes your stomach feel terrible. In order to fix a stomach ach, many people drink milk of magnesia or Mg(OH)2. If I drink 18 x 1023

particles of Mg(OH)2, then how many grams of Mg(OH)2 did I drink?

Stop 6 – Paris, France

Stop 7 – Vietnam

Stop 8 – Tokyo, Japan

Closing TimeClosing Time• Homework 3.7 due Thursday/Friday