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?

How To Get Rich According To Grant Cardone

Example dividing a whole by a unit fraction

View All

YC Fireside: Surbhi Sarna + Adam Elsesser - CEO of Penumbra

Hi everybody, welcome! And Adam, thank you so much for being here today. Yeah, thank you for having me. I, uh, I want to apologize in advance maybe there’s a little noise in the background. My headphones didn’t work and I’m at a medical conference, so ho…

2015 AP Physics I free response 2 a and b

Some students want to know what gets used up in an incandescent light bulb when it is in series with a resistor: current, energy, or both. They come up with the following two questions: in one second, do fewer electrons leave the bulb than enter the bulb?…

Olympic Training During a Pandemic | Podcast | Overheard at National Geographic

High jump is a part of me. This is Priscilla Frederick Loomis. She’s a track and field athlete, a high jumper, and she’s training for the 2021 Olympic Games. I look at the timer; 59 seconds remain. I fix my hair and roll back my shoulders. I look at the …

This Greek Cave is Teeming With History—and Bodies | National Geographic