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Stoichiometry Tutorial

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30 everyone missed your coffee here with another chemistry lesson and today we're going to do the mole ratio is a very important concept especially if you're going to be any good at Stoke Yama tree so pay attention and take some notes some assumptions I'm going to first of all that you know the periodic table second that you know molar mass and if you don't let's go back to some of the other videos I have them watch them  and I'm going to believe that you understand how to use your calculator and remember there are lessons on YouTube about each of these subjects or in this lesson the mole ratio moles to moles moles to grams and particles to moles and much much you need a periodic table you will need pie Atomic ions  you need to cheer for cow later  no you must know how to write a chemical question how to balance a chemical equation and you must know Avogadro's number turn the mall and of course as always there are videos on these are you ready let's get started  Baltimore ratio  a ratio of the amounts of reactants and products using call fission of a chemical reaction  and there's are coefficients in this example do we have copper and silver nitrate and there's the moldable ratio one mole of copper for two moles of silver nitrate so couldn't one mole of copper II two moles of silver now these are mole ratios that we can use to do magical things Brown to moles of silver to 2 moles of silver nitrate which reduces to a one-to-one relationship now let's look here a practice problem what is the mole ratio for oxygen to water  I hope you said one mole of oxygen to two another practice problem same equation equation is balanced but don't always believe me check and make sure should I balance them correctly and if I didn't send me an e-mail please  what is the mole ratio for hydrogen to water 32 and of course that reduces to one alright let's use the mole ratio for changing moles of a to moles of B  the mole ratios are used as a conversion factor to change between substances that means we can take moles of a and change it into moles of B and that's like magic so here's an example or equation Jen with copper and silver nitrate how many moles of copper are needed to react with 3.5 moles of silver nitrate  look situation here how many moles I was like to write what I'm looking for on my chemical equation so you look up there breathing it in Roscoe get the mole ratio and the mole ratios one mole of copper for every 2 moles of silver nitrate go to our magic board and use the mole ratio cross out the unit sir  plug in shock get that cow calculator app  can boom  using 3 sig figs and if you're not sure about sig figs there's a video on that go back and and it was the Grand vice-versa so now we can use this to change moles to grams or grams to moles as check it out 2 grams using the molar mass nephew not sure about molar mass go back a few lessons find the video and you'll see about molar mass but we can change moles of a 2 grams of a downright magical  here's an example how many grams in 3.50 moles of water use molar mass and so the molar mass of water is 18.02 grams can we get that by adding up all the individual molar masses of the elements involved score of the board would take the 3.5 moles and X the conversion which is 18.02 G of water per one mole of water cross out the units do the math plug and chug and Wallah we've got 3 sig figs it 63.1 g H2O no let's go to the vice versa the grams to moles how many moles in 153 grams of sodium bad or table salt I get use molar mass answer the molar mass of salt is 58.44 G going to the magic board okay using our molar mass notice that you can always get it in the right order if you make your units unit analysis and of course there's a video on that go back find it go to that video if you're not sure about how to do unit analysis or dimensional analysis how teacher might call it it's one of the best ways to make sure you have everything together  plug-in show and there were in this time sig figs 150 3.0 is 4 sig figs  most particles and life Laura remember what I represent of particles are you can have atoms ions for me to units and molecules also remember one mole is 6.022 X 10 to the 23 of anything most particles use Avogadro's number to change moles to particles  moles of a two particles of a this is so cool example how many molecules in 3.50 moles of water molecules are particle and use this to 6.02 * 10 - 23 molecules per one mole cuz I'm old is a number just like a dozen is 12 who is 6.022 X 10 to the 23 to the board 3.50 moles H2O times are conversion are you in the shop guess what plug and chug and we have 2.11 or 2.11 * 10 is 24 molecules of water and of course 3 sig figs  what's your particles to moles Avogadro's number to change particles to moles  particles to moles  how many moles in 3.61 * 10 - 24 molecules GH4 which is methane  but yet our particle is molecules and so we're going to use this to convert but this time its flipped over cuz we want molecules cancel out to the board 3.61 x 10 to the 24th molecules of methane in one mole of methane over 6.022 * 10 - 23 molecules guess what let's cross that are units you no plug-in chug and 5.99 moles of methane with 3 sig figs questions be sure to send an email to Mystic skip mr. Causey. And don't forget if you have a problem that you could send me that you want worked out for problem of the week I'll go ahead and do that just shoot off email to me with your problem and I'll feature it on one of my problems of the week  don't forget to check out mr. Causey term for PowerPoints videos and much much more  also subscribe Studies have shown that increases your IQ have a great day and happy ions

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