PPT Slide

Average Atomic Mass

Relative atomic mass: average masses of isotopes:

Naturally occurring C: 98.892 % 12C + 1.108 % 13C.

Average mass of C:

(0.98892)(12 amu) + (0.0108)(13.00335) = 12.011 amu.

Atomic weight (AW) is also known as average atomic mass (atomic weight).

Atomic weights are listed on the periodic table.

Atomic and Molecular Weights