The Mole: Avogadro's Number and Stoichiometry

Рет қаралды 592,764

9 жыл бұрын

Yes, I know moles are adorable furry creatures. This is a different kind of mole! A numerical mole. And we need to understand them to be able to make predictions about reactions. Let Professor Dave take you through the finer points.
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Пікірлер: 473

@indrareddyakkaluri3733 6 жыл бұрын

Your intro is legendary

@IITJEEADVANCEXD 2 жыл бұрын

And outro also

@sirishavejendla4156 2 жыл бұрын

Telugu Vaaru kada meeru

@lordwetrustl7080 6 жыл бұрын

I knew Jesus was a teacher but i didn't know he taught chemistry

@hehehehaw7 5 жыл бұрын

Underrated comment, take my upvote.

@fallencity4066 4 жыл бұрын

Sophisticated comment about underrated comment , Here take my up-vote.

@elmerlopez4146 4 жыл бұрын

Piggintins my chem teach calls him science Jesus

@grantlong7788 4 жыл бұрын

he is NOT jesu:(

@marktaylor7162 4 жыл бұрын

I thought Jesus was a car mechanic, because Jesus built my hotrod.

@matthewcecil8552 7 жыл бұрын

I'm a senior biomedical science student from FSCJ, and previously a tutor. You did a great job in this video. Definitely a clear and concise explanation, which is the most important aspect of any chemistry lesson with maths.

@ProfessorDaveExplains 7 жыл бұрын

thanks kindly!

@missishu2431 7 жыл бұрын

Sir you really maid my day...i finally got interested in Chemistry

@tonybatycki Жыл бұрын

Wow never expected to see FSCJ in a comment. Anyway, Go Jags!

@josiahwhite3157 5 ай бұрын

@@missishu2431Ain’t no way u said “maid” learn grammar wit yo goofy ahh

@MoleLife-mn9bq Ай бұрын

I am the real Mole

@Fjuron 2 жыл бұрын

To fully understand, I often have to watch your videos twice or pause because the information is so densely packed. But I love it. Feels very good when you figure it out. It forces you to think about it in your own way and build your own mnemonic. Active learning. 👍

@zucchini9177 6 жыл бұрын

OH MY GOSH I AM ABOUT TO CRY! I have a test on this tomorrow and know nothing about the material but now that I've watched this I finally do. Thank you so much!!!!!

@jamesmanning8269 4 жыл бұрын

Diana Enriquez how’d the test go?

@grantlong7788 4 жыл бұрын

did you pass

@RandomPerson-hd9sb 3 жыл бұрын

@@grantlong7788 sure, passed away

@valestuffs 3 жыл бұрын

no she ded

@zucchini9177 3 жыл бұрын

ValeStuffs I’ve been summoned from the dead?

@mitchyboy41 3 жыл бұрын

Just wanted to say, to all the students, trying to comprehend this, you're not alone. I've pulled out my hair for 3 days trying to learn this. Just breathe, getting frustrated won't allow you to learn it any easier.

@AAIVE 3 жыл бұрын

thanks, mitch!

@misfire32 3 жыл бұрын

@@simoncharlene8947 Thx

@megajihamsikaa 3 жыл бұрын

Thank you

@real_GANGSTA_ 2 жыл бұрын

Which standard you are in

@SCP--mw7tx 2 жыл бұрын

i struggled for a few days, and then soon realized it's just some easy mathematics.

@charlieann8661 7 жыл бұрын

Thank you for taking the time to do these videos!

@freedomofspeech122 8 жыл бұрын

Thank you for all of your videos! You're a great teacher. Thanks for all of your hard work and efforts to help us chem students!

@ProfessorDaveExplains 8 жыл бұрын

+May C it's my great pleasure! spread the word!

@freedomofspeech122 8 жыл бұрын

+Professor Dave Explains I sure did! I shared your channel with a few homeschooling Facebook groups in BC, Canada.

@tonybatycki Жыл бұрын

@@ProfessorDaveExplains any recommendations of books about Avogadro and the process of how he developed his equation? Fascinating that he found this number.

@xdanx01 7 жыл бұрын

I finally get stoichiometry! Thank you so much for this video

@doremi1414 2 жыл бұрын

I'm a Korean student and I'm really into science. Your videos helps me a lot cause you use simple words, giving great explains. You are the best prof for me. Thanks a lot for your hard work.

@kentheengineer592 Жыл бұрын

Learn More About Analytical Math & How to Think in Abstraction

@doremi1414 Жыл бұрын

@@kentheengineer592 Maybe in university. thanks for the recommendation

@williamconrad1087 4 ай бұрын

By simple, you mean words like stoichiometry and stoichiometric.

@TenNineD Ай бұрын

@@williamconrad1087it’s like Dave saying “for example” rather than saying “For a concrete demonstration of the illustration, we can observe”

@expiredflunky5603 6 жыл бұрын

Thank you jesus

@sreevivasaraghavan6848 3 жыл бұрын

I am thing professor Jesus

@---fb6zs 6 жыл бұрын

Very easily to understand! Thank you so much 😊 I will watching all of your videos ❤️

@christinayang2658 2 жыл бұрын

okay you know what I got an A in chemistry in highschool but never knew the purposes of these concepts..... I really enjoy your constant reasoning on why we use moles in the first place! It really puts the whole picture into perspective vs just having my teacher mostly explain the math portion so I just learned how to do the math to get correct answers on my exam and homework..... the big picture and purpose for me was for sure lost. Thank you for your reasonable explanations!

@titidechdamrongwut1351 7 жыл бұрын

Keep pushing this VDO , I will go thru all your VDO. Thank you 3 times.

@kent7966 5 жыл бұрын

I have been using his videos to study for midterms

@roysolomon4755 5 жыл бұрын

Your the best

@sarayhazuki4709 4 жыл бұрын

Thank you so much for your videos! your videos are short and have all the information, plus your illustrations help a lot to understand more!

@edwintafalla589 3 жыл бұрын

Thank you Professor Dave. So much learning about your upload videos

@austinsporn8432 7 жыл бұрын

you have saved me

@wilts8965 4 жыл бұрын

I see what you did there

@OIOTV-zo9qp 7 жыл бұрын

Thank you for helping. hard to find people like you. I am going to share it. Thanks

@BollimunthaNavyasai Ай бұрын

Thanks for all your chemistry videos

@stu_0618 3 жыл бұрын

You litterally saved my chemistry GCSE. Thank you so much!

@veryhealthy9962 Жыл бұрын

If you are a self-learner, believe me when I say the amount of info Dave puts per video is extremely dense, but listen patiently and let it run through your brain until you get it. That tingle in the brain is similar when you finally understand something in arithmetics!

@saitejamandiga2916 6 жыл бұрын

Thanks for all of ur videos sir My sir taught us but I didn't understand but after seeing ur videos anyone won't have ang doubts

@user-ww3pf4cr8c 3 жыл бұрын

Your explains is more than great Mr Dave👏👍

@inoxide5454 9 ай бұрын

i love being taught by a Foo Fighter

@richardtriance5207 9 ай бұрын

"i've got another confession to make..,"

@GriteKidsTV 3 жыл бұрын

i wasnt listening in class last time and i have a test, you just saved my ass

@chiklachikla7641 2 жыл бұрын

So how did the test go

@jackmorvan813 4 жыл бұрын

Great video, David!

@praviinashanbalagan1563 7 жыл бұрын

You have everything I need thanks how about making video clips of you doing experiment in General chemistry maybe it helps me to know the procedure

@mychaelpierce8049 2 жыл бұрын

Great video. Thanks for sharing!

@akira_asahi 2 жыл бұрын

Thank you for the video. I am grateful for your time and contribution. Kind regards, Akira.

@alexandrashields2600 3 жыл бұрын

Dude, thank you so much for helping explain this!! Bravo!!

@gbmsg282 3 жыл бұрын

First time I was able to actually understand the reason behind all those calculations. Thanks man!

@stupidsapien7304 2 жыл бұрын

Thank you professor ! It helped me alot.

@jacquelineoonzhien3234 3 жыл бұрын

Thank you so much for the video!

@sunflowervol.6790 6 жыл бұрын

Thank you so much sir. It's probably the best way to explain it so simply😊...A small request sir, Can we have an extended video on the same topic as it is a whole big chapter piled up.... plz do it if possible sir.

@ProfessorDaveExplains 6 жыл бұрын

what's not in this one that you're looking for? it might be in another clip.

@angeliemaebonaobra4448 7 жыл бұрын

Professor Dave! Thank you!

@maesie_alexa4084 3 жыл бұрын

Watching 2 hours before deadline!! Thank youuu

@MARTZX1111 3 жыл бұрын

Thank u for this tutorial.. its very helpful..

@connerbrandy9185 3 жыл бұрын

Thank you, Helped a lot!!

@jimjimmy3131 6 ай бұрын

I got only one question, why did that chemistry teacher that hated her job and students in general made my day so difficult instead of simply explaining to a 15 year old kid such a formula. Hod damn, why do teachers become teachers when they cannot teach and dislike kids ffs.😅 even after all those years of this video being uploaded. I would like to thank you for the explanation.

@jzzh1 6 жыл бұрын

thanks so much! you got a new subscriber

@dominicnikon6276 5 жыл бұрын

Awesome video thank you so much

@k_Why 2 жыл бұрын

Just had a quick question. I did the comprehension exercise in kind of a roundabout way calculating the weight of the CO2 and H2O then using both those values to figure out the weight of the O2 and adding them. I got the right result, but the weight on both sides of the equation isnt actually the same. I got 92,7g on the left side and 95,4g on the right side. I doubt that we actually created mass anywhere especially because this looks like a combustion reaction that releases energy. Mass defect wouldnt be enough to explain almost 3 grams anyway. Now did i just miscalculate and got the right solution through dumb luck or what's going on? Edit: figured it out. i mistakenly used 46 as the as the atomic mass for CO2 when its actually 44. i still got the right solution because i devided by that same number when i converted to O2

@jimbynumsierravistahs2319 4 ай бұрын

I want to use this in a high school chemistry class. My issue is the ambiguity when it comes to where the numbers came from when going from mole of 1 thing to moles of the other. Somehow emphasizing that the numbers came from the balanced equation would prevent a lot of confusion.

@zeinabmuhammed4549 6 жыл бұрын

Thank you professor dave 😇

@HenriFaust 2 жыл бұрын

In the first example, you rounded once for each conversion factor. In the second example, you combined all the conversion factors into a single operation and only rounded at the end. These are not the same method, and achieve differing results. *Method 1:* 32.8 g H2O and 73.0 g O2 *Method 2:* 32.7 g H2O and 72.7 g O2 Which method of rounding is correct?

@callumalmighty 2 жыл бұрын

Nice one Dave!

@priovag2632 3 ай бұрын

Your teaching is great

@cardiyansane1414 2 жыл бұрын

@ 5:24 It looks like they have done two conversions at the same time , maybe it would be easier to understand it is broken down step by step

@steezyspamsl223 5 жыл бұрын

saving me from chemistry finals 😂😭

@triple_gem_shining 9 ай бұрын

literally love dave

@socceralex12345 7 жыл бұрын

Thx 4 the vid

@arway4766 3 жыл бұрын

I don't know how good you are at making music but could you possibly make a full "professor dave explains" song... Idk what lyrics you'd put into it but you're the expert add some science topics make them rhyme do whatever it honestly doesn't matter as long as I get a longer version of the intro lol

@madylinn9235 5 жыл бұрын

Thanks prof

@ammyvl1 2 жыл бұрын

it took me a couple tries but I got it! thanks so much

@linaberkani309 4 жыл бұрын

Thank you sooooo muuuuch

@universal6906 3 жыл бұрын

Thanks for You clear my dought

@ameennasser5674 8 жыл бұрын

i didn't like chemistry till saw your chanel thank you boss

@lakshminarasimhamurthyvish9204 8 жыл бұрын

That's how #ProfessorDaveExplains !

@grantlong7788 4 жыл бұрын

you welcome mr. bossman. glad you sawed chanel

@Roy-mk9zl 5 жыл бұрын

Thanks sir.

@adhiyanthaprabhujeyashanka2091 3 жыл бұрын

Yes I finally understood this😉, thank you so much professional professor dave, love from India 😁, I will suggest to my friends to watch you, the best as always ❤️

@Dragon-Slay3r 9 ай бұрын

With a botox jab?😂

@peterclancy3653 10 ай бұрын

All I can remember of stoichiometry is warm summer days, blowflies buzzing on the windows and the drone of a old chem teacher. 56 years ago. AD(after Dave ) it finally clicked!

@ameennasser5674 8 жыл бұрын

if you please explain some mathematics that is mostly in chemistry so that we understand faster the fraction part is confusing if you could explain it in easy way that would be wonderful

@ProfessorDaveExplains 7 жыл бұрын

it's just basic arithmetic, but don't worry, i've got math tutorials coming soon!

@ciaranlonergan9910 3 жыл бұрын

Love you Dave

@old-tech Жыл бұрын

Remember that, like he said, the answer may very depending on where you round. In the case of the comprehension question, the answer is based on if you didn't round until the last number, which totaled to 72.7. If you did what he did in the first example question, and round the answer of 20 • (1/44) to 0.455, you'd end up with 72.8g for the final answer. If you ended up with that, you technically didn't do it wrong. Again, as Professor Dave said, it depends on when you round.

@DaveGrean Жыл бұрын

Thanks for reminding me, I got 72,8 despite having used a calculator so I was losing my mind, lmao

@ansumann 2 жыл бұрын

Thank you so much

@Dg-ii5xk 2 жыл бұрын

Thanks a lot!

@sskybluezen 4 жыл бұрын

I suck at chemistry, but after watching couple of your vids I might pass in my upcoming exam. Thanks a lot !!!!!

@NeuronalAxon 4 жыл бұрын

How'd it go?

@irenecuartocruz6371 4 жыл бұрын

Thank you because we have a reporting about this... Thank you very much... It is a big help...

@Dragon-Slay3r 9 ай бұрын

Ive already been stung there 😂

@loshithasahan7164 6 жыл бұрын

Before I watch this video this lesson made a MASSIVE headache for me.......THANK YOU VERY MUCH PROFESSOR DAVE !

@just7815 2 жыл бұрын

prof dave is a genius. he makes a lesson no brainer.

@Dragon-Slay3r 9 ай бұрын

That was the najd interview yesterday

@atanaciogarza7176 3 жыл бұрын

Thank you

@user-mu5fw3ik2w 4 жыл бұрын

2:50 Why is this composition reaction not displacement reaction?

@user-xu6ie9js9z 2 ай бұрын

Bro is about to measure the amount of alcohol molecules that he's going to turn his glass of water into.

@jiinjung1445 4 жыл бұрын

Hi, professor Dave. May I ask you what's sig fig of the last question? I rounded up 20/44 as 0.454 as I thought the sig fig was 3? but it gave me a wrong answer.

@DaveGrean Жыл бұрын

The sig fig are 3, but you rounded wrong. According to my calculator the result is 0,454545... so rounded up it makes 0,455, not 0,454. Remember you need to round up from 5 onwards, not 6!

@narniansworld9735 3 жыл бұрын

Thank you sir ❤️🙏🙏

@incrediblestudios5609 2 ай бұрын

I love you Professor Dave

@yigitcanbaysal824 2 жыл бұрын

I wonder professor David what is stoichiometric point.Could you explain me?

@RedToastt Жыл бұрын

where do we get the 20g from at 3:28?

@ThingsOut 8 ай бұрын

I don’t understand this! 3:27 How do you multiply?

@AmarSingh-xf8di 7 жыл бұрын

good video of chemestry

@EpicSchizophrenium 4 жыл бұрын

So If I would know how many Mols of O2 I have than would I have 4/5 of a mole of Water because the ratio is 4/5

@dionysioschris9405 2 ай бұрын

Thanks

@newone8463 5 жыл бұрын

Thank you 'awesome' broh

@user-tv8ck8bd2g 2 жыл бұрын

This was an excellent recap for me. I hadn't been in school for nearly a year and was about to dig through my old notes to pick up the basics again. But, I remembered your channel and this video's saved me a lot of hassle. Thanks!

@bilimAdimlari 2 жыл бұрын

you're good teacher

@MsAsh496 6 жыл бұрын

You are a gift from God, ... would you mind doing more o-chem videos?!

@sunflowervol.6790 6 жыл бұрын

Hello sir. Thank u for the quick reply. Stiochiometry has this sub topics which were not included - eudiometry, limiting reagents, volumetry and Iodometry which we would like to be explained by you sir as you r the only one to keep so simple and to exact point. Hope you will help. Thank you sir.😊

@ProfessorDaveExplains 6 жыл бұрын

limiting reagents has its own clip so definitely check that one out. the other words i've never even heard of!

@sunflowervol.6790 5 жыл бұрын

Ok sir.

@hshsndjd2845 Жыл бұрын

@@sunflowervol.6790you are definitely indian

@oluwatosinoluwafemi6331 3 жыл бұрын

You are so wonderful !

@johnnyWZL Жыл бұрын

Can we use O2 to find how many moles of water there is?

@slimeymeatballs 2 жыл бұрын

My chem teacher made me watch this. I still don’t understand shit

@s2sboc38 2 жыл бұрын

Yo this tweet doin numbers

@jobekirkuk 2 жыл бұрын

Your videos are Nuklary. Good job

@study4life443 Жыл бұрын

Hello, I've been confused at 4:03 Where did 1moleC3H8/44.0 g C3H8 come from? I know that we need to multiply by one in order to not change the equation, the thing that's confused me is how do we know that C3H8 has a mass of 44.0 g.

@ProfessorDaveExplains Жыл бұрын

It's the molar mass, just use the periodic table.

@spitfire184 5 ай бұрын

For anyone reading this after the fact, I think it's: Carbon (6 protons + 6 neutrons) x 3 = 36 Hydrogen (1 proton + 0 neutrons) x 8 = 8 36 + 8 = 44

@Stephenc35753 26 күн бұрын

So you said that 0.455 moles of propane is equal to 1.82 moles of water, but wouldn't you have to add in the moles of the O2 as well? Seeing as you can't make water H20 from just the propane?

@kashishy538 9 ай бұрын

Thnks man ..❤

@thej680 7 жыл бұрын

it took me a while to figure out that you just made up the 20g C3H8 and basically said that C3H8 is 1/4 the moles of water in the product, so you could multiply the 20g of C3H8 to figure out the moles of water. Then you could convert that into grams afterwards. However, is it possible to convert, say we knew the mass in grams of 5O2, into moles of water with the same reasoning that the ratio of moles of oxygen to moles water is 5/4?

@ProfessorDaveExplains 7 жыл бұрын

yes absolutely! just make sure you convert mass of O2 into moles of O2 first!

@gabriels2395 6 жыл бұрын

Thank you so much again! So I can say that "mole" is the number of protons (or neutrons) needed to get 1 gram of them. Right?

@ProfessorDaveExplains 6 жыл бұрын

yes that's one way to look at it! technically it's the number of carbon-12 nuclei that will equal 12 grams, but the math works out almost exactly the same.

@alderamin1402 2 жыл бұрын

I didn't understand what you are saying can you explain it to me

@demon_hawkeye5269 2 жыл бұрын

@@alderamin1402 I think it's due to the fact that protons and neutrons are almost the same mass so they both count as 1amu, so since moles are amu converted into grams 1mole of protons/neutrons would be 1g

@alderamin1402 2 жыл бұрын

@@demon_hawkeye5269 yes probably since he /she said just the number of protons I did not get it. thanks but I also really wonder about why 1 amu is equal 1 g. I asked it to my chemistry teacher but she did not know :'''')

@demon_hawkeye5269 2 жыл бұрын

@@alderamin1402 it's not that it's equal to 1amu, in fact it's very much the opposite to convert a 1amu neutron to 1g of neutrons you would have to have an avagadro's constant amount of that 1amu neutron, essentially, this is the number of things (be they individual subatomic particles, individual atoms, molecules or whatever else) in one mole of that thing it is 6.02×10^23 this is the same for anything you're trying to get a mole of