Moley, moley, mole…  Objective:  SWBAT perform stoichiometric conversions from mole to mass, from mass to mass  Catalyst:  What is.25 of a dozen?

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Presentation transcript:

Moley, moley, mole…  Objective:  SWBAT perform stoichiometric conversions from mole to mass, from mass to mass  Catalyst:  What is.25 of a dozen?  If a dozen hotdogs weighs 3 kilograms, how much does 3 dozen hotdogs weigh?

Agenda  Catalyst  OMG! YOUR NEW BFFL! The mole.  Bring back the train tracks  Exit Question

What is a mole to us chemists?  A benign overgrowth of cells because of a failure in mitosis?  NO! But gross…  A rascly little rodent?  NOOOO!  A TV show featuring celebrities?  NOOOOO!  Then WHAT IS IT?????!!!???!?!?!???!!!!

The Mole Think of the term “ a dozen ”… How many donuts are in a dozen? How many eggs are in a dozen?

The Mole Just like a dozen refers to 12 objects …

The Mole Just like a dozen refers to 12 objects … … the mole refers to …

The Mole Just like a dozen refers to 12 objects … … the mole refers to … 6.02 x particles

The Mole This number is called Avogadro ’ s number … 6.02 x ,000,000,000,000,000,000,000

ATTENTION!  Today’s goal is for you to learn how to “Set-up” these problems. Therefore, even if you do not have a calculator you need to make sure that you set-up the problems in your notes.

What’s the point of all this?  Key Point #1: Avogadro's number is used to convert between grams, moles, and atoms/molecules.  It all relates back to the mole…  Guess what’s coming back…

TRAIN TRACKS!!!  Step 1:  What to what?  Step 2:  Write conversion factor(s)  Step 3:  Train tracks

Avogadro ’ s Number Conversion factor: 1 mol = 6.02 x atoms 1 mol = 6.02 x molecules 1 mol of pennies = ? You may want to copy this down…hint hint cough cough

Avogadro ’ s Number 1 mol = 6.02 x atoms How many atoms are in.25 mol N 2 ?

Avogadro ’ s Number 1 mol = 6.02 x atoms How many atoms are in.25 mol N 2 ?.25 mol N 2

Avogadro ’ s Number 1 mol = 6.02 x atoms How many atoms are in.25 mol N 2 ?.25 mol N 2 1 mol N x atoms I guess you can use your calculator for this…

Scientific Notation on the calculator  If you need to type 6.02 *  Type “6.02 ‘EE’ 23” instead.  SAVE TIME AND LOOK COOL!

Your turn! Whiteboards. How many atoms are in 2 moles of C 12 H 22 O 11 ?

OOOH, I want some more train tracks!  Key Point #2:  Molar mass is the total mass in one mole of a substance. 1 mol X = ____ g X  BUT HOW DO WE FIND THE MASS???  1 mol Oxygen = 16 g  1 mol of He = ?

Molar Mass 1 mol C =

Molar Mass 1 mol C = 12 g C

Molar Mass 1 mol Na =

Molar Mass 1 mol Na = 23 g Na

Molar Mass-Can you figure out this one?? 1 mol CO 2 =

Molar Mass 1 mol CO 2 = C = 12 gO = 16 gO = 16 g

Molar Mass 1 mol CO 2 = C = 12 g+ O = 16 g + O = 16 g

Molar Mass 1 mol CO 2 = 44 g CO 2 C = 12 g+ O = 16 g + O = 16 g

Molar Mass 1 mol KNO 3 = K = + N = + O =

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

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

Molar Mass- Let’s try a problem 1 mol KNO 3 = 101 g If we have 3.5 moles of KNO 3, how many grams would we have? WHAT to WHAT?

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

Step yo’ game up!  How many atoms are there in 14 grams?

Independent Practice  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.

Exit Question  How many molecules are in a mole of NH 4 ?  How many grams are there in 2.3 moles of NH 4 ?