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[–] 3 points 2 weeks ago

It actually isn't, it's quite close, but due to nuclear binding energy 1 mole of hydrogen is actually a little more than a gram. Because the mole is defined for C12, it is the only nuclide (atom with a specific number of protons and neutrons) where a mole is it's atomic number in grams, 12 in the case for C12

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