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The Mole Notes Video

Added Feb 08, 2019 •

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hey what's up this is the video on chapter 7 the first thing is talking about atomic mass number that is scribing for molecule don't really get into too much of that just write this yellow down here four hour purposes here we're just going to call it the atomic mass atomic mass and we get that because of izotope a bun which we already talked about when we talk about that's the one you're the reason why our hydrogen atom has no neutrons so anyway so if we get here and I was hoping that you'd be able to get to the mall let's just talk about them all the way through dozen bananas cuz it Doesn't people that doesn't ask whatever that doesn't no matter what it is how big how small a dozen is always so a dozen equal no matter what bananas and now they'll have enough. so it doesn't but it's still no matter what there we go so right measure the amount of a substance are just right from there right that down that tells the amount of a substance is this mini particle that's a really long like a dozen but doesn't write this is a really really cute kids were talking about extremely tiny parts is Mariah Carey write a $1 bill which is a ridiculous what we do then is we take this number called Avogadro's number kind of like avocado Avogadro's number measure the amount of a substance 6.02. Number no matter what it is items whether it's cars people houses hydrogen atoms water molecules it's that Mick moles and grams are related down this is what I was talking about going to use the number underneath the map the mass in grams of 1 mol has a mass from molar mass of 1 gram abbreviation for mole of hydrogen equals 1 grams of hydrogen so whatever the number underneath atoms of hydrogen or have a mass of 1 grams in the same way one more carbon-12 carbon-12 and weighs 12 grams or have a mass of 12 grams of 12 G per mole has a mass of 12 grams convert between moles and grams in this is a big part of what we're going to do conversions in chemistry it'll be the same except her a lot more steps you can go from the amount of moles the other way map to the amount of money you can even go to how many atoms you have before you can go from moles to atoms we're going to be doing and let's look at how to calculate in grams of 5.5 Mol stop one you want to write what all right you've already been given you have five point five miles the first you want to ride that so you've done number one right up you have a 5.5 moles of iron right what what year converting what is the engram what's so we already have we're going to grams right on top what's going to go in just a second seven step number three right one mole what are grams up top and one mole conversion driving like this that's already been given is how many grams in this is where the molar mass so what you going to do if you're going to look at on the periodic table and I really wish I could so we can go ahead 7 go into 5655.8 grams of iron in one this is the number of GFS E350 5.8 26 so that's not what I'm using that we know that there's 55 grams in MO 55.8 grams of iron in one cancel out and since this is on top and the number 4 decide rich are you going to know that if the number that you're working with then you just multiply straight across and then you're going to divide it out you just say 5 calculator 5.5 * 55.8 306.9 ml converted to grams that's why we put that on top because it's going to be 360 iron super sloppy and I went through it real fast watch it a couple of times if you need to and then we're going to do a lot of these in class and that

Uploaded by Craig Long.

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The Mole Notes Video

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