STOICHIAWESOME!!

Catalyst How many grams are there in 2.3 moles of

dihydrogen monoxide?

How many moles are there in 325 grams of Strontium?

*If you accidentally took one of the orange calculators yesterday, please return it!

A little bit of both

Problems involving mass (Grams) and number of particles (atoms/molecules) need to use 2 conversion factors

___g Y =___atoms Y

___atoms Y =___g Y

Practice

You have 13 min to do the back of the homework sheet. Your goal is to make sure that EVERY group member can set up the following problems on their own.

I will be walking around quizzing members of each group on how to make the correct conversion factors Gram-atoms worksheet

When everybody in your group can complete the problems, finish the worksheet from yesterday

Let’s kick this into real life…

Us chemists use equations

This is where it gets fun!

S’molar Ratio

Smore Equation:

How do you make a S’more?

2 GC + 1 M + 2 C 1 Smore

GC= Graham cracker, M= marshmallow, C= chocolate pieces

2 GC + 1 M + 2 C 1 Smore

What does this mean?

For every 2 graham crackers, how many s’mores do we produce?

If we had 6 pieces of chocolates, how many s’mores could we make?

If we had 6 marshmallows, how many s’mores could we make?

It’s the same thing with reactions…Key Point #1:

You must BALANCE the equation in stoichometric problems FIRST. Then, what to what.

Otherwise, you’ll never get the right answer

Stoich-i-ncredible

Balanced Equation: Coefficents = Moles

__ Al + __ O2 --> __ Al2O3

If we have 9 mols of O2, how many moles of Al2O3 would form?

First we have to balance the eq.

FIRST STEP???

S’molar Ratio

Balanced Equation: Coefficents = Moles

4 Al + 3 O2 --> 2 Al2O3

If we have 9 mols of O2, how many moles of Al2O3 would form?

SECOND STEP???

Mol O2 Mol Al2O3

Follow this to success

Box the two compounds you are dealing with. The others do not matter for that problem!

4 Al + 3 O2 --> 2 Al2O3

If we have 9 mols of O2, how many moles of Al2O3 would form?

The only way to move from one compound to another in a conversion is through a mole-to-mole ratio.

S’molar Ratio

Balanced Equation: Coefficents = Moles

4 Al + 3 O2 --> 2 Al2O3

If we have 9 mols of O2, how many moles of Al2O3 would form?

THIRD STEP???

9 mol O2

S’molar Ratio

Balanced Equation: Coefficents = Moles

4 Al + 3 O2 --> 2 Al2O3

If we have 9 mols of O2, how many moles of Al2O3 would form?

9 mol O2 mol Al2O3

mol O2WHAT IS THE CONVERSION FACTOR???!?!?!?!?!?

S’molar Ratio

Balanced Equation: Coefficents = Moles

4 Al + 3 O2 --> 2 Al2O3

If we have 9 mols of O2, how many moles of Al2O3 would form?

9 mol O2 2 mol Al2O3

3 mol O2

S’molar Ratio

Balanced Equation: Coefficents = Moles

4 Al + 3 O2 --> 2 Al2O3

If we have 9 mols of O2, how many moles of Al2O3 would form?

9 mol O2 2 mol Al2O3 6 mol Al2O3

3 mol O2

Your Turn!

Balanced Equation: Coefficents = Moles

__Co + __ F2 --> __CoF3

How many moles of CoF3 are produced when 1.25 mol Co reacts?

Your Turn!

Balanced Equation: Coefficents = Moles

__ S8 + __ O2 --> __ SO2

If we start with 2.5 mol S8

how many moles of SO2 will form?

Your turn-10 mins

Do the first 2 problems on today’s worksheet.

Make sure everyone in your group can do the problems! Help each other out!

If you are truly a chemistry G, you will figure out the next two.

Can you step it up??

Balanced Equation: Coefficents = Moles

__ KCl + __ O2 --> __ KClO3

How many moles of KClO3 will form if we start With 64 grams of O2?

STEP IT UP!!

Balanced Equation: Coefficents = Moles

2 KCl + 3 O2 --> 2 KClO3

How many moles of KClO3 will form if we start With 64 grams of O2?

64 g O2

Exit Question

Consider the reaction: Cu + AgNO3 Ag + Cu(NO3)2

If 12 moles of copper undergoes this reaction, how many grams of Silver will be produced?

Don’t forget to BALANCE!

Exit Question