Final answer:
The average atomic weight for carbon is 12.01 amu.
Step-by-step explanation:
The average atomic weight for carbon can be calculated using the percentages of its isotopes.
For carbon, 98.892% is 12C with an atomic mass of 12 amu, and 1.108% is 13C with an atomic mass of 13.003355 amu. To find the average atomic weight, we multiply the percentage of each isotope by its atomic mass and add them together: (0.9889 x 12 amu) + (0.0111 x 13.003355 amu) = 12.01 amu.
Therefore, the average atomic weight for carbon is 12.01 amu.