December 35 0, 2.009 x 10 3 1. What is the molar mass (g) of lithium hydroxide, LiOH? 2. How many atoms are in 2.05 moles of O 2 ? (Train Tracks!) 3. Challenge!

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Presentation transcript:

December 35 0, x What is the molar mass (g) of lithium hydroxide, LiOH? 2. How many atoms are in 2.05 moles of O 2 ? (Train Tracks!) 3. Challenge! How many grams are in 0.35 moles of Argon? (Train Tracks) Please take out HW to be stamped! Grab a calculator or take yours out too!

Today’s Agenda  Catalyst  HW Review  Applying Stoichiometry to Chemical Reactions  Practice, Practice, Practice…and more PRACTICE!  Exit Question

Today’s Objectives  SWBAT perform stoichiometry to convert between moles, number of particles, and molar mass.

Exit Question from Yesterday 1. What is a mole? 2. Calculate the molar mass of H 2 CO 3.

Molar Mass 1 mol KNO 3 = 101 g K = 39 g + N = 14 g + O = (3)16 = 48 g

Molar Mass- Let’s try a another type of problem 1 mol KNO 3 = 101 g If we have 3.5 moles of KNO 3 (instead of just 1 mole!), how many grams would we have?

Molar Mass 1 mol CH 4 = g If we have 20 grams CH 4, how many moles of CH 4 do we have?

Practice Time!  1, 11, 16… we will go over to show you how to solve this hilarious assignment!  Attach your work on a separate sheet of paper.  Mole Facts on the back!

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: There are 3 steps to solving stoichiometric problems involving chemical reactions: 1) Balance the equation 2) Figure out what to what 3) Convert using train tracks

Three Types of Stoichiometric Problems Key Point #2: There are 3 types of stoichiometric problems: 1) Mole to mole 2) Mole to mass 3) Mass to mass

Stoich-i-ncredible: Mole to Mole! Balanced Equation: Remember! Coefficents = Moles __ Al + __ O 2  __ Al 2 O 3 If we have 9 moles of O 2, how many moles of Al 2 O 3 would form? First we have to balance the eq. FIRST STEP???

Balanced Equation: Coefficents = Moles 4 Al + 3 O 2  2 Al 2 O 3 If we have 9 moles of O 2, how many moles of Al 2 O 3 would form? SECOND STEP??? What to what? Mol O2  Mol Al2O3 Stoich-i-ncredible: Mole to Mole!

Balanced Equation: Coefficents = Moles 4 Al + 3 O 2  2 Al 2 O 3 If we have 9 moles of O 2, how many moles of Al 2 O 3 would form? THIRD STEP??? Train Tracks! Stoich-i-ncredible: Mole to Mole!

Balanced Equation: Coefficents = Moles 4 Al + 3 O 2  2 Al 2 O 3 If we have 9 moles of O 2, how many moles of Al 2 O 3 would form? 9 mol O 2 mol Al 2 O 3 mol O 2 WHAT IS THE CONVERSION FACTOR???!?!?!?!?!? Stoich-i-ncredible: Mole to Mole!

Balanced Equation: Coefficents = Moles 4 Al + 3 O 2  2 Al 2 O 3 If we have 9 moles of O 2, how many moles of Al 2 O 3 would form? 9 mol O 2 2 mol Al 2 O 3 3 mol O 2 Stoich-i-ncredible: Mole to Mole!

Balanced Equation: Coefficents = Moles 4 Al + 3 O 2  2 Al 2 O 3 If we have 9 moles of O 2, how many moles of Al 2 O 3 would form? 9 mol O 2 2 mol Al 2 O 3 = 6 mol Al 2 O 3 3 mol O 2 Stoich-i-ncredible: Mole to Mole!

Your Turn! Mole to Mole! Balanced Equation: Coefficents = Moles __Co + __ F 2  __CoF 3 How many moles are CoF 3 are produced when 1.25 moles of Co reacts?

What about this?? Is it still mole to mole? Balanced Equation: Coefficents = Moles __ S 8 + __ O 2  __ SO 2 If we start with 2.5 moles S 8 how many moles of O 2 are needed for S 8 to fully combust?

Can you step it up?? Mole to Mass Balanced Equation: Coefficents = Moles __ KCl + __ O 2  __ KClO 3 How many moles of KClO 3 will form if we start with 64 grams of O 2 ?

Balanced Equation: Coefficents = Moles 2 KCl + 3 O 2  2 KClO 3 How many moles of KClO 3 will form if we start With 64 grams of O 2 ? 64 g O 2 Can you step it up?? Mole to Mass

Balanced Equation: Coefficents = Moles NH 4 NO 3  N 2 O + 2 H 2 O How many moles of NH 4 NO 3 is needed to produce 25 grams of H 2 O? Your Turn!!! Mole to Mass

The hardest type! Mass to Mass! Balanced Equation: Coefficents = Moles __ N 2 + __ H 2  __ NH 3 How many grams of NH 3 would be produced if 56 grams of N 2 are reacted?

Another Example! Mass to Mass Balanced Equation: Coefficents = Moles __ Fe + __ H 2 O  __ Fe 3 O 4 + __ H 2 How many grams of Fe 3 O 4 will form if we start with 9 grams of H 2 O?

More Practice Balanced Equation: Coefficents = Moles __ H 2 + __ O 2  __ H 2 O How many grams of H 2 O will form if we start with 3.0 moles H 2 ?

Practice, Practice, Practice … Did I mention practice? Balanced Equation: Coefficents = Moles __ Cu + __ AgNO 3  __ Cu(NO 3 ) 2 + __ Ag How many grams of Ag would form if we react 8 grams AgNO 3 ?

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 + AgNO 3  Ag + Cu(NO 3 ) 2 1. If you start with grams of copper (Cu), how many grams of silver (Ag) will be produced? Don’t forget to BALANCE!