I have a chem test this week and I’m absolutely stumped on this, I’m terrible at math so any help would be appreciated.
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I’ll try my best to summarize [this video](https://youtu.be/Z_TjGRPPR9Q) by Steve Mould: say you have some chlorine and some hydrogen, and you want to make hycrochloric acid – you need the same number of atoms of each element. So how many grams of each do you put in to ensure a complete reaction? Well, you can do their atomic weight, but in grams instead of atomic weight units. And if you need more, you can do two times their atomic weight, but in grams instead of atomic weight units. “Their atomic weight, but in grams instead of atomic weight units” is a mouthful, so we call that one mole for short.
But what if your molecules aren’t elements going in? What if it’s something like hydrochloric acid with lithium hydroxide? Well, you’ll do the sum of the componants’ atomic weights, but in grams instead of atomic weight units. Once again, that’s an entire mouthull, so we just say one GFM.
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