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Stoichiometry: Understanding the Use of the Mole in Stoichiometry

Added Jan 26, 2016 •

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Molar Conversions

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buddy I'll mr. coffee here coming to you from beautiful Atascocita Texas today we're going to talk about the mole and what's important about the mole is that you learn what it can do you need to can the mall because it's a big part of what we do and Stoke Yama tree and much of the advanced chemistry so you need to learn the home  you're going to need a periodic table and you're going to need a calculator for today's lesson  Harrison's assumptions on can you make when you're familiar with the periodic table  that you know how to use a calculator that you can perform unit conversions and you're familiar with atomic masses  so why the mole what the mole was constructed show that scientist or chemist in particular would have a way to count atoms ions and molecules without having to count them into they could do it by using mass they could way out certain amounts and by using the mole they would know how they had her how many they had and it's because atoms and molecules are really small so we can't count them individually so we came up with a mole now if you want to know what what was really all about go watch one of my lessons about Avogadro's number in the mall but right here I don't want to go through the history I just want you to understand what a mole is and how to use  what's a mole mole is an Avogadro's number of anything and Who's godderz number is 6.022 X 10 to the 23 that's an important number and that's what I'm all is animal is just a number like a dozen is 12 or a pair is to a mole is 6.022 32 x 10 to the 23rd which is a humongous number but that's because atoms are so small small what is molar mass well molar mass is an element or a mole of an element  is the numeric equivalent of the comic mashbutton grams show the molar mass is the atomic mass in grams of molar mass is mass of 6.022 x 10 to the 23 particles no matter what the particle is bigger particles more grams smaller particles fewer grams some hydrogen is .01 atomic mass of one mole of hydrogen is 1.01 grams or carbon is 12 01 atomic mass units and one mole of carbon is 12.01 G the mole of an is the numeric equivalent of the atomic mass in grams what about the molar mass of a compound elements make up compounds then all we have to do is add up the atomic masses of the different elements in the count and is the numeric equivalent of that in grams  water is 18.02 atomic mass units there for one mole of water would be 18.02 grams  carbon dioxide equals 44.01 atomic mass units there for one mole of carbon dioxide is 44.01 G little kitchen conversions not important for you to understand the history as much as it is that you understand how ammo is used  and one mole is 6.022 X 10 to the 23 particles and 6.022 x 10 to the play particles is one mole and particles can be Adams it can be ions it can be molecules it can be formula unit but these conversions are used to go from moles to particles or particles to moles Let's do an example how many atoms are in 1.5 moles of gold  well I'll take 1.5 moles multiply are the conversion of 6.022 x 10 to the 23 atoms per mole I know that I've got it setup right cuz morals cancel out I'm going to plug into again jocular and I get 9.03 x 10 to the 23 atoms of gold in 1.50 moles no in this conversion we have moles per grams or grams per moles and we use this conversion go between the mackerel and the micro and the subatomic world and somos programs very important suck an example out go to my cable and let's pick oxygen and oxygen is 16.00 G and therefore one mole or 16.00 grams of oxygen is one mole oxygen and one mole of oxygen is 16.00 grams of oxygen and with that knowledge that we can get from the periodic table we can use to convert from Mall rules to moles to grams or grams to moles to molecules here's an example how many moles are in 29.58 G 29.58 G I know that I want to take the grams of one change to moles therefore I'm going to use molar mass go to should I table and there's carbon which is going to be 12.01 per mole and I've got it setup so that my grams cancel out play the Indian plug and chug can I get 2.463 rolls of carpet who's another example how many atoms in 5.2 grams of sulfur  there's my grants now want to change to Adams so I'm going to have to go to moles and then particles there's no Direct grams to particles but I can go from grams to moles to particles so I'll go to my pride table get my molar mass and offer is 32.07 grams I know I have it setup right cuz grams cancel up and then I'm going to take and multiplied by the number of atoms in one mole remember mole is just a number so doesn't matter what I have as long as I remember that a mole is 6.022 X 10 to the 23 atoms Finn small Sulphur cancels out and I'm going to plug and chug  can I get 9.78 x 10 to the 22 atoms sulfur  NASA huge alright let's recap  the mall is just a number like a dozen which is 12  a mole 6.022 x 10 to the 23 of anything  a molar mass is the numeric equivalent of the atomic mass Ingress and the reason that's possible you can find out in one of my other videos  so check up your chem coach.com  And subscribe to my YouTube Tybee Island

Uploaded by Laura Houston.

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Stoichiometry: Understanding the Use of the Mole in Stoichiometry

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