Question

what is atomic mass? And why we only use C(12) only as standard? Explain.​

Answer 1

Answer:

1. The atomic mass is the mass of an atom. Although the SI unit of mass is the kilogram, atomic mass is often expressed in the non-SI unit dalton where 1 dalton is defined as 1⁄12 of the mass of a single carbon-12 atom, at rest.

Explanation:

2. Atomic mass is based on a relative scale and the mass of 12C (carbon twelve) is defined as 12 amu; so, this is an exact number. ... Each carbon atom has the same number of protons and electrons, 6. 12C has 6 neutrons, 13C has 7 neutrons, and 14C has 8 neutrons and so on. So, we must specify which C atom defines the scale.

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