Find the weighted average mass for the following elements and identify the element by its mass.

Problem A
Mass(amu) Abundance
Isotope A: 49.946 4.35%
Isotope B: 51.941 83.79%
Isotope C: 52.941 9.50%
Isotope D: 53.939 2.37%

Problem B

Isotope A: 84.912 72.17%
Isotope B: 86.909 27.83%

Question

Find the weighted average mass for the following elements and identify the element by its mass.

Problem A
                   Mass(amu)           Abundance
Isotope A:     49.946                4.35%
Isotope B:     51.941                83.79%
Isotope C:     52.941               9.50%
Isotope D:     53.939              2.37%

Problem B

Isotope A:       84.912            72.17%
Isotope B:       86.909             27.83%

aaronq · Answer

massA*abundance+massB*abundance+...+massD*abundance= weighted average