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The Mole
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Күн бұрын003 - The Mole
In this video Paul Andersen defines and explains the importance of the mole. The mole is simply a number (like a dozen) used to express the massive number of atoms in matter. It serves as a bridge between the mass of a compound and the number of particles. It is represented in chemical reactions as the coefficients before reactants and products.
THE ANSWER: 1.91 x 10^22 molecules of Glucose
Music Attribution
Title: String Theory
Artist: Herman Jolly
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"File:ThermiteReaction.jpg." Wikipedia, the Free Encyclopedia, July 22, 2013. en.wikipedia.or....
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@damenpickering4731 10 жыл бұрын
This really helps for a year 11 student studying chemistry. Keep up the good work.
@berni1602 11 жыл бұрын
Do you know where the chemist go shopping? To the mole :P Good video, thanks.
@JenniferSmith-jw3dw 3 жыл бұрын
I'm confused a bit by the math. When I do the last division problem, I get 3.340732519*10^22 not 3.01*10^23. What am I doing wrong?
@angelicaporro4060 9 жыл бұрын
Burn under water? Well now we know how sponge bob can have a campfire :P
@skillgaming8722 7 жыл бұрын
Angelica Porro yeah right
@lydiah3018 5 жыл бұрын
Hi! I'm watching this video to try to understand mole conversions enough to tutor my sister. In the practice problem, my answer was 1.91 x 10^23. Is that what it should be? Because the solution has 1.91 x 10^22 and I wasn't sure if that is just a typo or not.
@lydiah3018 5 жыл бұрын
oh wait nevermind I figured out what I did. forgot to move the decimal point and remove one exponnent... whoops
@ThorstenSchulte 9 жыл бұрын
I think the mole concept is one of those things in science that is at the same time incredibly simple but (and it sounds like a contradiction) as just difficult to "wrap your head around". Main thing is: There are always, always, always the SAME amount (or number) of molecules in one mole: One mole of CO2 has 6.023 X 10^23 molecules (of CO2) in it. And 6.023 X 10^23 molecules happen to weight: 12+16+16 = 40 grams. It's really just a convenient constant number because as Paul points out a couple times: It's the bridge between Mass and Molecules.
@ethanbrubaker1990 9 жыл бұрын
Wow, these 7 minutes have been a lot of help! THANK YOU!
@CatrinL 11 жыл бұрын
My teacher uses your videos every week for our AP Bio class and I just used this video because I was confused with something in my textbook, so decided to look it up :p
@baltod4978 9 жыл бұрын
Thank you so much for these videos! They do help out a great deal in understanding everything
@brookewilliams4265 9 жыл бұрын
I don't understand the math behind it. Like when he's crossing off grams and then just comes up with a number what is he actually doing?
@rachelwalton813 8 жыл бұрын
+Brooke Williams Same here.
@brookewilliams4265 8 жыл бұрын
+Rachel Walton would you need help? I understand this stuff now
@rafnaegels8913 8 жыл бұрын
Yes, i do. What have you learnd that this video doesn't fully cover?
@rafnaegels8913 8 жыл бұрын
I've got AMU of 180.18. So 1 mole 180 grams right? Than i do the same thing as Andrew did with the other example 57.2 / 180.18 = 0.31
@rafnaegels8913 8 жыл бұрын
I.ve rounded the 0.315 to 0.32 6.02 X 0.32 = 1.9264 is thos correct? It isn't 1.91 but that's maybe an calculator issue. Is the math correct here?
@gracehan6290 10 жыл бұрын
You are awesome. You have helped me learn so much material over a variety of topics within the past year. Thank you is not enough!
@Sarah-gz9pu 8 жыл бұрын
Thank you or this! You explain it better than my teacher does.
@audreyw1508 4 жыл бұрын
5:04 what did he divide 18 by to get 3.01? how did the 3.01 come about?
@mikey002 3 жыл бұрын
*9.01* (6.02*10^23) / 18.02 = 3.01 * 10^23 molecules of water.
@helenneal6304 11 жыл бұрын
I love this teacher and I hope he continues to make more and more videos for pple to learn from. I love the cations and anoins where he says the cations are like cats who have paws and it is a "pawsitive" lol :) I'll remember this till I die.
@quetzallium4733 6 жыл бұрын
Really interesting stuff. One caption was off (NO for CO2) but apart from that the concept of a mole was explained in a much clearer way than KA or any other source I went to.
@silasmotyka2250 5 жыл бұрын
Someone get this guy a Nobel prize!
@mrunaldupte5483 10 жыл бұрын
You have provided a awesome explanation Thank you alot
@katieheitman2797 8 жыл бұрын
This video has a typo. When Mr. Anderson is talking about NO, he mentions that the a.m.u. is 30.01. When he is mentioning grams, it says that CO2 has 30.01 grams, but you just said that CO2 had 44.01 grams. Sorry to point this out like this, but it might need to be fixed.
@nightfox380 8 жыл бұрын
I noticed this too and was thrown off. In the closed captions, he says it correctly, but in the video and audio, he repeats CO2 from the previous example. It should be 1 mol of NO = 30.01 g.
@erincarpenter1695 8 жыл бұрын
Yeah that threw me off too
@JavaScriptJolt 8 жыл бұрын
Yeah, he meant NO not CO2.
@natejipson6916 7 жыл бұрын
Extremely helpful. In seven minutes explained what took my teacher 2 hours.
@Dewychewy123 10 жыл бұрын
At 3:46, u said that "1 mole of C02 is 30.01 grams". It should be NO instead of CO2.. typo :)
@evanandnature 9 жыл бұрын
You are superb. Thank you for your work! You are doing an amazing job- I am very grateful for helping me!
@ms.j5785 4 жыл бұрын
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@frodobaggains 11 жыл бұрын
You just explained something that I was confused about for 11 years :P
@nicksimon4536 9 жыл бұрын
Yes, it was a huge help. These videos mean a lot to me, thanks man!
@eliser4976 7 жыл бұрын
I don't really get the whole gram to molecular thing. How do you convert it to molecules?
@rumpleforeskin7032 7 жыл бұрын
you do a mole bridge calculation. you do the conversion dividing by its atomic mass (but in the unit of grams). at 5:25 in the video, he shows the 5.72 grams of glucose. to solve this, you find the molar mass of glucose, which is 6 carbons (6*12.01~84 grams), 12 hydrogens (12*1.01~12 grams), and 6 oxygens (6*16.0~96 grams). you find the molar mass is 180 grams/mole. you then divide the given sample (5.72 grams) by the molar mass (180 g/mol) which gives you .0318 moles of glucose. that means that your sample is 3.18% of a mole of glucose. You then multiply the number of moles by avogadro's number (6.022*10^23) which gives you 1.91*10^22 molecules of glucose in the 5.72g sample. TL;DR divide gram sample by molar mass (same as atomic weight on periodic table but grams as unit), then multiply by 6.022*10^23
@sammie8933 10 жыл бұрын
Oh My God If Only You Were My Chem Teacher!!!! Thank You.... Very Helpful
@macw.7686 3 ай бұрын
5:19 where did the 3.01 come from??? On the left side you have 6.02 (from the mole equation) but then that 6.02 suddenly changes to 3.01. I have no idea where that number came from.
@plutos_universe 7 жыл бұрын
Thank you, Mr. Anderson!
@abscharger6025 9 жыл бұрын
yap thanks a lot it really helped me and i got 96 percent on mole test
@kevinfalcon3705 9 жыл бұрын
For the question of Glucose, shouldn't it be .19 x 10^23 ? Do you move the decimal forward? because 5.72 grams of Glucose 1 mol of Glucose 6.02 x10^23 molecules of Glucose x ------------------------- x ------------------------------------------------- 180.18 g of Glucose 1 mol of Glucose = .19 x 10^23 5.72 x 6.02 = 34.4344 34.4344 ----------- = .19111111111.... 180.18
@CoolMultiGamer 9 жыл бұрын
Your answer's right but correct scientific notation would be 1.91 x 10^22. You move the decimal and reduce 10^23 to 10^22
@kevinfalcon3705 9 жыл бұрын
CoolMultiGamer oh ok. Didn't know that. Thanks.
@Weeble68 9 жыл бұрын
+Kevin Falcon can you talk me through how you got your answer please? I just cant grasp this.
@rachelwalton813 8 жыл бұрын
+Weeble68 Me either, I thought 9.01g of water, divided into 18.02 g of water meant that there are 2 mols of water. I don't understand the answer he came up with. Neither do I understand why the crossing off grams. I get that it's something to do with cancelling each other out but don't know how or why.
@richardbilon6502 8 жыл бұрын
wat was tat again??
@lupemaydon 7 жыл бұрын
Did the question. Got it right = 1.91 x 10^22 . Feeling super smart. Thanks Man!
@1800denko 10 жыл бұрын
This was helpful, now I know something lots of sophomores don't!
@alexeinechiporenko4607 6 жыл бұрын
Thank you for this video. Much appreciated and can't wait to see more from you!
@viktorvondoom9119 2 жыл бұрын
So summarised, would this definition be correct? "A mole is a unit that indicates a volume of a certain element, expressed in a quantity of particles, which is 6.02*10^23. This volume is reached when the number of the mass of this quantity of particles, , expressed in grams, equals ("is the same as" or "matches") the number of the atomic mass of the element, expressed in atomic mass units."
@TheAbd1233 10 жыл бұрын
how does carbon 12 have 12.01 amu if 1 amu = carbon 12/12?
@ufatemav4509 10 жыл бұрын
That pretty much helped but is it that for finding the atoms, particles, molecules and formula units, Avogadro's number has to be used?
@MegaVernon42 9 жыл бұрын
Great help!! Thank you sir!!
@samuraiapocalypse9349 9 жыл бұрын
Thank you Mr Anderson for spreading scientific knowledge. You are amazing 😁
@alexsmith3104 9 жыл бұрын
Mr Anderson, thanks for the videos! Very helpful
@TheMcProfGaming 10 жыл бұрын
Thank you for this awesome vid
@kentheengineer592 4 жыл бұрын
so you are weighing carbon 12 using some presumed analytical equipment but my question is how do you estimate the mass to charge ratio and give an estimate for the total number of atoms within that sample presumably the problem when teaching this subject is that they leave the physical world out of the equation and leave students guessing
@DaBIGTOE33 6 жыл бұрын
Great Video, it was extremely helpful and comprehensive
@toddschaap674 3 жыл бұрын
You may need to fix typo at the 3:49 minute mark. Otherwise, very good.
@deannalyndunn2002 Жыл бұрын
YAY!!! I got the correct answer!! Chemistry is my most difficult subject. I really struggle. But thank you sooo much for your help!! I actually got the answer correct!
@conniepierce328 2 жыл бұрын
Great video. Thanks for sharing!
@yashpradhantm4364 11 жыл бұрын
U reli awsme bozemann i being a indian lyks to watch ur videos which i understnd very easily
@mythserene 7 жыл бұрын
at 7:01 pretty sure you meant 1 mol of NO, not CO2, because the amu was referencing NO, and also, it wouldn't add up for CO2. (Which was your first example and is 44.01g.) A student I tutor pointed this video out to me, and I think it's very well done. But judging by the confusion in many of the comments, I figure anything to make them more confused can't be good.
@saonajoybailey2815 9 жыл бұрын
This video is very helpful thankyou!!!!
@marstanjx 9 жыл бұрын
i calculated the answer is 2.03x 10^22, and is that wrong?
@gianasung2916 3 жыл бұрын
i rounded up to 3.01
@gianasung2916 3 жыл бұрын
but idk maybe ur right
@AhmedEkri 9 жыл бұрын
You gained a new sub, thank you.
@HEJUSTBROUSING 10 жыл бұрын
thank you very much, i needed this
@dhavalshah3881 9 жыл бұрын
Thanks heaps! i finally understand this concept :)
@user-zt8zz9zu5m 6 жыл бұрын
i just wonder how your mind can gather all these sciences
@diginate9878 4 жыл бұрын
6 years later So if I'm asked "What is The Mole?" In an exam, what do i have to write?
@fitofight8540 7 жыл бұрын
The basic question that needs to be answered is how did Avogadro counted the number particles?
@danialabbas269 7 жыл бұрын
5:10 to 5:19, he did the right type of calculations , but i just got 0.5, i didnt take the extra step. Would that be nessesary ?
@ac-en7iv 7 жыл бұрын
Here he is finding the number of molecules in 9.01g of water NOT the number of moles, so after finding 0.5 you have to do the next step: 0.5 x 6.02x10^23 to get the number of molecules. I also got confused at first but then realised lol
@mkjnbs4288 10 ай бұрын
Mr. Bozeman, you rock.
@JaneDoe-lq4en 10 жыл бұрын
I really want to see if I get this. For some reason this has always been hard for me to understand. In the examples you provide, is it accurate for me to say "There are 6.02 x 10^23 molecules in 30.01 grams of Nitrous Oxide." and "There are 6.02 x 10^23 molecules in 44.01 grams of Carbon Dioxide." Thanks!
@EzioHanitore 10 жыл бұрын
yes that is correct
@JaneDoe-lq4en 10 жыл бұрын
ok great. thank you!
@aman7066 7 жыл бұрын
Well explained ...got that in the first time
@RadiantFreeEnergyResearch 11 жыл бұрын
Outstanding video. Thank you.
@katneumann2570 7 жыл бұрын
Helpful as always
@carolynstein6879 2 жыл бұрын
There is a mistake in the video. When you are talking about the mass of NO, then show CO2 on the screen. Shouldn't you have NO on both sides? That part did not make sense
@jasmineraees2697 8 жыл бұрын
thank u so much :D i love the way you explain things about science
@lucashergert2308 10 жыл бұрын
Awesome tutorial. Thx mate
@tootoophoto 7 жыл бұрын
Hello, the answer to the problem says to the 22 power, why the 22 and not 23rd (isnt that what the formula is?) please explain, super lost here :( Thank You!
@juguernautajuguernauta5504 7 жыл бұрын
Because, setting up the dimensional analysis you'll have 5.72*(6.022*10^23) (the many grams you have times Avogadro's number to find how many moles that's gonna give you) then divide it by 1 mole of the element (sum of it's atomic weight = 180.18). Setting it up, 34.44584*10^23 / 180.18 = approx. 0.191*10^23. (HERE IS YOUR 10^23). But you want Scientific Notation, so you can't have a zero point something. You have to displace the digit one decimal place to the right, and, by doing so, you'll eliminate one of the 10^n, THEREFORE, you'll go from 0.191*10^23 to 1.91 * 10^22.
@MylensPerspective 4 жыл бұрын
@@juguernautajuguernauta5504 THANK YOU! I was going crazy as to why the 5.72 seemed to be converted to 57.2 to get the answer of 1.91 instead of my answer 0.191*10^23.
@drillher6464 10 жыл бұрын
this dude can teach
@rudrapandya2603 10 жыл бұрын
Massive understatement!
@afroninjawithswag 9 жыл бұрын
Thanks for the help, you could have explained how to calculate the mol a little better.
@Manima108 2 жыл бұрын
thanks! I'm a PhD in chemistry and needed a refresher/s
@danielbowman7226 4 жыл бұрын
The Math here is confusing. You somewhat glanced over the RATIOS.
@nosho409 4 ай бұрын
Missed opportunity at 2:10 to use a mole of moles for you explanation.
@sweetnsoursassy 9 жыл бұрын
I still need help. How much does 1.00 mole of copper contain?
@jenniferezeh6810 8 жыл бұрын
+Tonya Bigham one of copper would contain 3.8528 times ten to the twenty fifth power. Because a mole equals 6.02 times ten to the twenty third power. And the atomic mass of copper is 63.546, so five would make the three become a four. And now copper becomes only 64. And you multiply the amount per mole by the mass of copper, which would give you your answer. So goes for the rest.....hope I didn't confuse you
@yooheyy9934 5 жыл бұрын
at 4.56 how can there be 18.02 it should be 17.01
@noahmueller709 5 жыл бұрын
its two hydrogens so its 2.02 + 16.00. dont worry i was tripped up too
@zainshakeelshakeel3043 7 жыл бұрын
best teacher
@yenneepuerto6559 9 жыл бұрын
did you divide the 18.02 and 6.02 to the nearest of what? ASAP
@candacehaley1469 3 жыл бұрын
Sharing with physical science students because the book doesn't explain why a mole is important besides having another word for 6.02 x 10^23. Thanks! Off to look for thermite burning under water video.
@brunofeitosafl 10 ай бұрын
Thanks!
@Trunks47r786 11 жыл бұрын
Better than Khan Academy. Way more organized and to the point.
@burningsilicon149 4 жыл бұрын
I just think of the mole as the number of protons or neutrons I must have to equal a gram of mass which turns out to be 6.022*10^(23) protons or neutrons and therefore a mole of a molecule that has say 200 protons and neutrons = 200 grams of mass,I would just treat it as a conversion factor from grams of a molecule to number of a molecules.
@selenapilgrim6576 7 жыл бұрын
i watched so many of these damn chemistry videos!!! im starting to hate chemistry everyday!!!
@MKJLimR 8 жыл бұрын
Thank you so much!
@LeCygneGris 11 жыл бұрын
Thanks a lot! Very helpful :)
@MD-wn4wl 2 жыл бұрын
How do you get 3.01 you literally said you divided 18.02 by 18.02 and it was somehow 3.01???? HOW DOES THAT MAKE SENSE
@bili4591 Жыл бұрын
Take a back step on all of what you listen and just reflect, he can do a lot of error. 6.02*10^23 molecules of water weigh 18.02 grams and so to have the number of molecules of water in « 9.01 GRAMS OF WATER » you need to do a CONVERSION. If you use the X product you do visually a table -> « 6.02*10^23 » at the top left and the value associated at his right « 18.02 grams » Now you have the number that do the difference so « 9.01 grams » Put it just below « 18.02 grams » and now you do the X product. « How ??? » it’s simple, you put your pen from 9.02 and you go to 6.02*10^23 « you multiply 9.02 by 6.02*10^23 » And you divided the result of this by « 18.02 ». The result of this calculus give the value searched below of 6.02*10^23 molecules so... 3.01*10^23 molecules of water for 9 grams of water.
@belialuedke1880 5 жыл бұрын
Beautiful. 👍
@sweetyy41 10 жыл бұрын
Thank you !
@stevenborchik9001 10 жыл бұрын
Right, the big hurdle a lot of students struggle with is that amu = g/mol
@JasmineGoodenDisciple 6 жыл бұрын
he go to dang fast
@frodobaggains 11 жыл бұрын
Thanks a 6.02 * 10^23...!!! :)
@SmokeyRose2487 9 жыл бұрын
Thank you!!
@ktmsbrl 4 жыл бұрын
Thank you!!!
@jamaicanvisa 11 жыл бұрын
I love you. You are my saving grace :)
@nicholasalkhawli6057 4 жыл бұрын
Can the answer be 0.19 times 10 to the 23
@jaeda9875 9 жыл бұрын
Can anyone tell me why I keep getting 1.91 x 10^24 every time I type it into my calculator?
@jaijaiswar9426 6 жыл бұрын
thanks sir
@ttranuyen 11 жыл бұрын
You're awsome! thank you!
@tokubetsuanbu7671 9 жыл бұрын
I still dont understand :( i think im going to fail chemistry ...
@cherryblossoms4528 7 жыл бұрын
Quantum Unicorn did you fail?
@snewl1085 7 жыл бұрын
I am slowly understanding... How did u end up going?
@zombieblood1675 6 жыл бұрын
Quantum Unicorn did you fail? I know it's 3 years later and all but did you?
@harshitkumar1144 6 жыл бұрын
so dumb we indian r intelligent
@hende8445 6 жыл бұрын
indians are just more grateful in education and parents force their children to take more serious as they live in a shit third world country who are unintelligent to develop and want their child to strain their mind for themselves so their child gives them money in the future...its a stingy concept as they were unable to learn themselves.If Indian people get more intellligent with their economic state it's normal for the younger generation to slack off but the place is shit so they struggle too much being ignorant to just be a doctor and dont get luxury
@shivukumar2564 7 жыл бұрын
osm and easy teachings
@akankshalanghani9177 6 жыл бұрын
that was helpful :)
@roqiakhawari6718 7 жыл бұрын
IT IS 6.02*10 THE POWER OF 23 AND IT IS LIKE A BRIDGE BETWEEN MASS AND PARTICLES.
@MohdZaheeruddins 5 жыл бұрын
Why are we dividing in h2o example
@yadavshashankkumar 9 жыл бұрын
U are amazing!!
Олимпийскому чемпиону Елдосу Сметову и его тренеру вручили ключи от квартир и машин в Таразе #Сметов
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