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Avogadro's constant

how did someone come up with this number?
ik its the no. of particles in one mole...but it just seems like such a random no. to define as a quantity, if you get what i mean?
also, is one mole of a substance= relative mass
thats what it says in my notes but it seems VERY wrong..... :/
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Dom0401
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A "mole" of something was originally based on Carbon-12. It is the number at which one mole of anything has equal mass in both grams as one molecule of that thing does in atomic units.

For instance one mole of carbon-12 is 12g and one atom of carbon-12 is 12 Daltons (atomic mass unit). 6.022x10^23 is just the number at which this happens. This is true for all chemical compounds. The number is just weird because it's a universal constant most of them are just wack the number system we use is completely abstract and made up. The universe doesn't care.

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