1. Molar Mass And Avogadro's Number
2. Khan Academy Moles Chemistry

Molar Mass And Avogadro's Number

• The average atomic mass (sometimes called atomic weight) of an element is the weighted average mass of the atoms in a naturally occurring sample of the eleme.
• Khan Academy, Prof. Added to favorite list. Molecular and Empirical Formulas - The Mole and Avogadro's Number - Formula from Mass Composition - Another mass composition problem - Balancing Chemical Equations - Stoichiometry - Stoichiometry: Limiting Reagent-Ideal Gas Equation: PV=nRT-Ideal Gas Equation Example 1-Partial.

As a chemistry nerd, Mole Day is one of my favorite days. What’s a mole, you ask? It’s another name for Avogadro’s number, 6.022 × 10²³. And 10²³ is today’s date – 10/23 – see how we did that?! Chemists, so creative. So really, it is just a number like a “dozen” or a “pair.” It is actually a really really big number that we could also write out as 602214129000000000000000. In fact, did you know that Avogadro’s number is more than a million times as big as the number of seconds since the Big Bang?

Chemists use moles to make counting easier, like when talking about numbers of atoms or molecules. We can actually count anything in terms of moles, like water molecules. How many molecules are in a cup of water, which holds about 240 g of water? It turns out that a cup of water contains about 8,000,000,000,000,000,000,000,000 molecules of water. That’s a lot of molecules and chemists don’t want to write that out every time, so we can also just call it 13 moles of water instead.

Khan Academy Moles Chemistry

You can learn more about Avogadro’s number and lots of other fun chemistry topics on Khan Academy. Happy Mole Day!

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– Yuki, Khan Academy Chemistry Fellow and fan of moles, both animal and chemical