The mole and Avogadro's number | Atomic structure and properties | AP Chemistry | Khan Academy

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One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant. The concept of the mole can be used to convert between mass and number of particles. View more lessons or practice this subject at www.khanacadem...
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True

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very true

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Thanks, Salman you're a Hero to us!

[@prasoonjha1816]

Sir I can't thank you enough, I was super confused in mole concept and Avogadro's Constant. My textbook gave just some equations without any good explanation what is mole, one can be 100% sure while hearing your lecture that his/her doubts will be clearly solved.

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[@reddevil0609]

How does the calculation from avg. atomic mass to g give us Avogadro's Number though?

[@AliceYobby]

So, the atomic weight of hydrogen is 1 because it has one proton. A mole of protons, would also equal a mole of hydrogen atoms, which would equal 1 gram. Because there are on average, 6.94 protons and neutrons in any amount of Li, a mole of atoms of Li would equal 6.94 grams. However, there are still a mole of protons and neutrons in 1 gram of Li.

[@ditoo2002]

I'm literally taking this rn in school, we haven't reached the calculation part yet, we're doing more ratio though.

[@maxco3412]

I'm doing it in college and we just started as well

[@ditoo2002]

@@maxco3412 interesting, good luck.

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Understood! Thanks 🙏

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You are the best !!!

[@Mina-xo6ii]

@khan Academy please do lessons about PLS (partial least squares regression)

[@braidenanderson2669]

Dang, knowing that 1 gram of gold is less than a mole of gold, meaning 1 gram of gold is equal to a mole of hydrogen

[@AliceYobby]

There are a mole of protons and neutrons in one gram of ANYTHING :)

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You teach things in a super awesome and understandable way🩵🩵

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why this channel has less views now

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I always hated schools but this, this isn’t school

[@konzeptwerks6710]

You did?
Are you actually speaking for Albert Einstein !??!

[@SoulReviving786]

Sir why u didnt mention the more easy and accurate formula for finding moles!

[@carsforkids3512]

I’m still confused 🤷‍♂️

[@yousefshello582]

Why sir you put 4 as Unified Atomic Mass Unit instead of 3 for the Li ?

[@jeetukumarkv]

thank u

[@lucaspeck7995]

The Avogadro has a number!!!

[@smokingterran6]

ok i got the part we need to find mol but i cant get the right answer. im using a TI-83 plus calculator, and i divide 0.0154/72.63=2.12E-4. not the answer of the vid 0.000212 what am i doing wrong on the ti-83 calculator?

[@harshitajangir8521]

How many moles of electrons do we have in a kilogram of electrons?

[@simpleyasser2251]

I've never felt so confused

[@jasonvegan5761]

Wow that’s a lot of aloms 😏

[@pancake3321]

anyone hear the phone notification at 5:02?

[@moonlitelive6735]

and at like 5:23

[@moonlitelive6735]

@Charles Logan wdym? tommyinnit?

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Amazing

[@hongyaness2580]

how 6.02214076 x 10^22 became 6.022 x 10^23 ?

[@hongyaness2580]

@@MV-sg9zh rounding doesn't change the power from 22 to 23

[@SandeepKumar-yy8ey]

Mole concept definition

[@andrewparesa5116]

Yes

[@Buddha-Einstein]

But why do we even need the concept of a mole? We can just make a chart of number of molecules /atoms per gram of every element and use that as an index just like the periodic table ? What is benefit of EVEN having the avogadros number?

[@JavaAidTutorials]

I love chemistry..

[@godxon_5648]

"Which is a lot"

[@cosmosapien6221]

How many atoms in a guaca-mole?
Avocado's number!

[@mahnoorehsan6325]

lmaoo

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Pls try to do in urdu.that would be helpful for many students

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S

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🇹🇷

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GG

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Sir please hindi me bhi video please

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Never gonna give you up
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[@truthcrusade8371]

Basically memorization and using tables, you don't explain sh*t in terms of how each term came to be and how each element ended up with all those numbers you are using. Teaching based on memorization is like catching a movie towards the end, it's like, what the hell happened here?!

[@AliceYobby]

If you watch the whole series in order you would have a better understanding.