# What is a unified atomic mass unit? How is it equivalent to 1 g/mol?

The unfied atomic mass unit is defined as the mass of exactly 1/12 of the mass of an atom of the carbon-12 isotope.

This indicates that precisely 12 grams of pure Carbon-12 is equivalent to precisely 1 mol. This serves as a benchmark for calculating all other atomic or molecular masses.

The relative atomic mass of hydrogen was first related to be 1, but as the amount of H-2 in hydrogen changed, they eventually used oxygen-16 to be 16, and for practical reasons, carbon-12 to be exactly 12 turned out to be better (easier to handle than the gases). The differences between the systems are negligible, and they are beyond the significance level for most chemical calculations.

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A unified atomic mass unit (u or amu) is a unit of mass used to express atomic and molecular masses. It is defined as one-twelfth of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state. One mole of carbon-12 atoms has a mass of 12 grams, which corresponds to Avogadro's number of atoms (6.022 × 10^23). Therefore, one unified atomic mass unit is equivalent to 1 gram per mole (g/mol) because one mole of carbon-12 atoms has a mass of 12 grams, which is numerically equivalent to Avogadro's number.

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