Question

If the mass of an atom of C-12 becomes half of its actual value then the atomic mass of phosphorous will change from
31 amu to what new value?​

Answer 1

Answer:

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. Why do we specify 12C? We do not simply state that the mass of a C atom is 12 AMU because elements exist as a variety of isotopes.

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