Question

Which isotope of carbon is used for getting relative atomic masses?

• A. C-12
• B. C-13
• C. C-14
• D. C-15

Answer 1

The correct option is A C-12

One a.m.u. or one 'u' is equal to $1.66053892\times {10}^{-24}g$ or $1.66053892\times {10}^{-27}kg$. It is equal to $\frac{1}{12}$ of the mass of an atom of carbon-12. It is used as a standard. The masses of all other atoms are determined relative to the mass of an atom of carbon-12.