Catalyst – December 5-3, (2000+9)

1. What is the molar mass (g) of CO2?

2. Using your answer to #1, calculate the mass (g) of 4.0 moles of CO2.

3. How many atoms are in 65 grams of CO2.

Please pass Homework up to the front!

Grab a calculator!

Today’s Agenda

CatalystMore Stoichi-stoichi-stoichiometry…

Practice ‘til the cows come home

Exit Question(Honors: Science Fair)

Today’s Objectives

SWBAT perform stoichiometry to convert between moles, number of particles, and molar mass.

SWBAT perform stoichiometry with chemical reactions.

S’molar Ratio

Smore Equation:

How do you make a S’more?

2 GC + 1 M + 1 C 1 Smore

GC = Graham Cracker

M = Marshmallow

C = Chocolate Piece

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: There are 3 steps to solving stoichiometric problems involving chemical reactions:

1) Balance the equation2) Figure out what to what3) Convert using train tracks

Three Types of Stoichiometric Problems

Key Point #2: There are 3 types of stoichiometric problems:

1) Mole to mole2) Mole to mass3) Mass to mass

Stoich-i-ncredible: Mole to Mole!

Balanced Equation: Remember! Coefficents = Moles

__ Al + __ O2 __ Al2O3

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

First we have to balance the eq.

FIRST STEP???

Balanced Equation: Coefficents = Moles

4 Al + 3 O2 2 Al2O3

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

SECOND STEP??? What to what?

Mol O2 Mol Al2O3

Stoich-i-ncredible: Mole to Mole!

Balanced Equation: Coefficents = Moles

4 Al + 3 O2 2 Al2O3

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

THIRD STEP???Train Tracks!

Stoich-i-ncredible: Mole to Mole!

Balanced Equation: Coefficents = Moles

4 Al + 3 O2 2 Al2O3

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

9 mol O2 mol Al2O3

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

Stoich-i-ncredible: Mole to Mole!

Balanced Equation: Coefficents = Moles

4 Al + 3 O2 2 Al2O3

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

9 mol O2 2 mol Al2O3

3 mol O2

Stoich-i-ncredible: Mole to Mole!

Balanced Equation: Coefficents = Moles

4 Al + 3 O2 2 Al2O3

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

9 mol O2 2 mol Al2O3 = 6 mol Al2O3

3 mol O2

Stoich-i-ncredible: Mole to Mole!

Your Turn! Mole to Mole!

Balanced Equation: Coefficents = Moles

__Co + __ F2 __CoF3

How many moles are CoF3 are produced when 1.25 moles of Co

reacts?

What about this?? Is it still mole to mole?

Balanced Equation: Coefficents = Moles

__ S8 + __ O2 __ SO2

If we start with 2.5 moles S8

how many moles of O2 are needed for S8 to fully combust?

Can you step it up?? Mole to Mass

Balanced Equation: Coefficents = Moles

__ KCl + __ O2 __ KClO3

How many moles of KClO3 will form if we start

with 64 grams of O2?

Balanced Equation: Coefficents = Moles

NH4NO3 N2O + 2 H2O

How many moles of NH4NO3 is needed to produce

25 grams of H2O?

Your Turn!!! Mole to Mass

The hardest type! Mass to Mass!

Balanced Equation: Coefficents = Moles

__ N2 + __ H2 __ NH3How many grams of NH3 would be

produced if56 grams of N2 are reacted?

Another Example! Mass to Mass

Balanced Equation: Coefficents = Moles

__ Fe + __ H2O __ Fe3O4 + __ H2

How many grams of Fe3O4 will form if we start

with 9 grams of H2O?

More Practice

Balanced Equation: Coefficents = Moles

__ H2 + __ O2 __ H2O

How many grams of H2O will form if we start

with 3.0 moles H2?

Practice, Practice, Practice…Did I mention practice?

Balanced Equation: Coefficents = Moles

__ Cu + __ AgNO3 __ Cu(NO3)2 + __ Ag

How many grams of Ag would form if we react

8 grams AgNO3?

Can you help each other step it up?? Sage and Scribe! (if we have time)

Find a partner in the class and follow directions.

After you finish, begin HW.

Exit Question

Consider the reaction:

Cu + AgNO3 Ag + Cu(NO3)2

1. If you start with 63.55 grams of copper (Cu), how many grams of silver (Ag) will be produced?

Don’t forget to BALANCE!