You don't need a formula for that. It's on the periodic table.
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atomic mass of carbon=12 atomic number of carbon=6
Carbon is a non meta element. Atomic mass of it is 12.
The mass of carbon -12 atom is known as standard atomic mass
atomic mass unit is equal to one-twelfth of the mass of a carbon-12 atomic mass is equal to one-twelfth of the mass of a carbon-12Atomic Mass is equal to the number of protons and neutrons.
12. The number 12 refers to the atomic mass. More precisely, to the sum of neutrons + protons; but this is usually close to the atomic mass. In the case of carbon-12, it is exact, by definition.