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?

Whoopi Golderg Wants Superheroes With Big Butts | StarTalk

Example calculating t statistic for a test about a mean | AP Statistics | Khan Academy

View All

Interpreting general multiplication rule | Probability & combinatorics

We’re told that two contestants are finalists in a cooking competition. For the final round, each of them spins a wheel to determine what star ingredient must be in their dish. I guess the primary ingredient could be charred spinach, romaine lettuce, cabb…

Voting rights | Political participation | US government and civics | Khan Academy

In this video, we’re going to do a brief overview of how amendments to the Constitution and federal legislation have increased voting rights over time. Now, why does this matter? Apart from just the innate value of voting rights in a democracy, it matter…

2015 AP Calculus AB/BC 3b | AP Calculus AB solved exams | AP Calculus AB | Khan Academy

Part B using correct units, explain the meaning of the definite integral. So, it’s the definite integral from zero to tal 40 of the absolute value V of T DT. In the context of the problem, approximate the value of that integral using a right Riemann sum …

Touring the Vulcan Rocket on the Launch Pad - Smarter Every Day 297