Happy Mole Day!

less than 1m read

·Nov 11, 2024

Hey everybody! Rocco T. Mole here to wish you a Happy Mole Day from all of us at Khan Academy!

Yes, moles! The chemistry concept, not the critter. Now, in case you’ve been living under a rock (like me), a mole is another name for Avogadro’s number which is (approximately) 6.022 times 10 to the 23rd. Kinda like how a “dozen” is another name for 12.

So why do we need a name for such a big number?! Well, we could write it like this: 602,214,129,000,000,000,000,000 (Thank you). But that would take a while! Moles make counting easier for chemists, particularly when talking about atoms or molecules.

So for the number of molecules in a cup of water, you could write an 8 with 24 zeros after it... OR you could just call it 13 moles of water instead! (Thank you Yuki) Isn't that easier?

Now, the moral of this story is: moles are the best! And if you want to learn more about chemistry, or anything, really, head to our website: khanacademy.org.

That's Khan as in Ghenghis, no relation; and Academy, as in academy. Happy Mole Day everyone! You can learn anything!

Are we still–we're not recording, right?

Estimating derivatives | Derivatives introduction | AP Calculus AB | Khan Academy

Sharing Nkashi: Race for the Okavango with people of the Okavango Delta | National Geographic

View All

How To Get Rich According To Jeff Bezos

There are a million ways to make $1,000,000. And this is how Jeff Bezos did it. He needs no introduction. Right. So let’s just cut straight to the chase. Customers have the money, not the competition. Well, many people think about the competition. Bezos …

Finding specific antiderivatives: rational function | AP Calculus AB | Khan Academy

So we’re told that ( F(2) ) is equal to 12. ( F’ ) prime of ( x ) is equal to ( \frac{24}{x^3} ), and what we want to figure out is what ( F(-1) ) is. Alright, so they give us the derivative in terms of ( x ), so maybe we can take the antiderivative of t…

Gaining the Trust of the Gorillas | Dian Fossey: Secrets in the Mist

KELLY STEWART: Dian Fossey was definitely a pioneer. I do not think that word has been overused. Before that, nobody had done a long-term study of gorillas. Nobody had studied them month after month and year after year. IAN REDMOND: She wanted to be the …

5 Stocks the Smart Money is Buying for 2024.