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A mole, often shortened to mol, is just a large number — approximately 6 x 1023, med andre ord 6 med 23 nuller skrevet efter det. Konceptuelt kan du tænke på det på meget den samme måde, som du ville bruge 'en bajillion'.

So one mole of calcium ions just means there are 6 x 1023 ions, 1 mol/L salt solution means you have put 6 x 1023 molekyler salt i en liter vand.

The only special property of this number is that if you take one mole of Carbon-12 atoms and put them together, they would weigh exactly 12 grams. Because a carbon atom weighs about 12 times as much as a hydrogen atom, one mole of hydrogen therefore weighs about 1 gram.