The relative abundance of three isotopes of carbon C^(12), C^(13) and C^14 are 98.892%, 1.108% and 2 xx 10^(-10)% respectively. If the relative atomic masses of these isotopes are 12.00, 13.00335 and 14.00317 amu respectively, find the average atomic mass of carbon.

The relative abundance of three isotopes of carbon C^(12), C^(13) and

1.	The relative abundance of three isotopes of carbon C^(12), C^(13) and C^14 are 98.892%, 1.108% and 2 xx 10^(-10)% respectively. If the relative atomic masses of these isotopes are 12.00, 13.00335 and 14.00317 amu respectively, find the average atomic mass of carbon.
Answer» SOLUTION :Average atomic mass of carbon can be obtained by averaging the relative atomic MASSES of its isotopes in the ratio of their abundance. Thus, Average atomic mass `(12.000 XX 98.892 + 13.00335 xx 1.108+ 14.00317 xx 2 xx 10^(-10))/(98.892 + 1.108 +2 xx 10^(-10))` `=12.011` amu