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Dive into the fascinating world of chemistry with our engaging exploration of moles! From calculating moles in various compounds like nitrate ions and chloride ions to celebrating Mole Day with humor and catchy songs, we’ll guide you through the important concepts of molar mass and Avogadro's number. Discover how to convert grams to moles and even use scientific humor to remember key principles. Whether you’re solving conversions or enjoying a weightlifting contest between Avogadro and Einstein, this guide makes learning chemistry fun and memorable!
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Warmup (5 minutes) 1.0 10-14 • (1.0 x 109)/(1.0 x 1023) = 2) How many moles are in 40.96 grams of nitrate ions? ( mole NO3-) 1 40.96 g NO3- ( g NO3-) 62.01 Take out your PT, lecture notes, calculator, and Molar Highway = 0.6605 mole NO3-
a tiny molelike creature with wings which drinks the blood of anyone who doesn't remember when Mole Day is the continual reverence of moles a word describing the Mole Day songs which are played over the loudspeaker moleskito moleism moleodic What do you get when you have a bunch of moles acting like idiots? What kept Avogadro in bed for two months? A bunch of Moleasses Moleonucleosis
Mole Day Song“Let It Be” = “Twenty-Three” When I find myself in times of troubleAvogodro's number comes to meSix point oh two two, e twenty three. The mole is a counting numberAnd you'll find few who disagreeSix point oh two two, e twenty three. Twenty three, twenty threeTwenty three, ya twenty three.A mole is six point oh e twenty three The molar mass of an atom is on The periodic table you will readThe number of atoms is six point oh e twenty three To convert from grams to atomsIt's the molar mass that you will needTimes by six point oh two e twenty three Twenty three twenty threeTwenty three, ya twenty threeA mole is six point oh e twenty three
Conversions • Using Avogadros Number • Multi-Step
Ex 1. How many molecules of CO2are there in 1.50 moles of CO2 ? 1.50 mole CO2 = 9.03x 1023molecules of CO2 (molecules CO2 ) 6.02 x 1023 1 (mole CO2 )
EX 2: How many moles of Na are there in 4.50 x 105 atoms of Na? 1 mole Na 4.50 x105 atoms Na ( ) ( ) = 7.48x10-19 moles Na 6.02 x 1023 atoms Na
EX 3:How many chloride ions are in 2.3 moles of Cl-? 2.3 moles Cl- (6.02 x 1023 ions Cl- ) (1 moles Cl- ) = 1.4 x1024 chloride ions
The Molar Highway Finding Various Quantities using The Mole Mass compound in sample # molecules compound in sample 1 mole of a compound Need: molar mass of compound Need: 1 mole = 6.02 x 1023 particles
4. Two scientists engage in a weight-lifting competition to see who is stronger (HOT!!!) Avagadro can bench press 7.85 x 1025 atoms carbon Einstein can bench press 6.78 x 1024 atoms einsteinium. Who can bench press the greatest mass? ( g C) ( mole C) 1 12.01 7.85 x 1025 atoms C ( atoms C) ( mole C) 1 6.02 x 1023 = 1570 or 1.57 x 103 g C ( mole Es) 1 ( g Es) 252 6.78 x 1024 atoms Es ( atoms Es) 6.02 x 1023 ( mole Es) 1 = 2840 or 2.84 x 103 g Es
5. Which is heavier:4.00 x 1014 molecules Al(NO3)3OR 2.00 x 1014 molecules of KNO3? ( mole Al(NO3)3) 4.00 x 1014 molec Al(NO3)3 1 ( g Al(NO3)3) 213.01 1 ( molec. Al(NO3)3 6.02 x 1023 ( mole Al(NO3)3) = 1.42 x 10-7g Al(NO3)3 ( mole KNO3) 2.00 x 1014 molec.KNO3 1 ( g KNO3) 101.11 ( molec. KNO3 6.02 x 1023 ( mole KNO3) 1 = 3.36 x 10-8g KNO3
6. A sample of 16.2 grams of MgBr2and a sample of 21.0 grams of AgBr are arguing over who contains more molecules! Who is correct? ( molec MgBr2) ( mole MgBr2) 1 6.02 x 1023 16.2 g MgBr2 ( mole MgBr2) 1 184.11 ( g MgBr2) = 5.30 x1022molec. MgBr2 ( mole AgBr ) 1 ( molec AgBr) 6.02 x 1023 21.0 g AgBr ( g AgBr) ( mole AgBr) 1 187.77 = 6.73 x 1022 molec AgBr
