Answer:
The average mass is simply a weighted average.
If we know the natural abundance (the natural abundance of an
isotope of an element is the percent of that isotope as it
occurs in a sample on earth) of all the isotopes and the mass
of all the isotopes we can find the average atomic mass. The
average atomic mass is simply a weighted average of the masses of all
the isotopes.
average mass C = (0.9889 x 12(exact) amu) + (0.0111 x 13.00335)
amu
= 11.8668 + 0.144337
= 12.011137185
12.01 amu
Explanation:
here it is my friend
