Answer to Question #95223 in General Chemistry for Kerin Sennett

Question

Silicon has three naturally occurring isotopes: Si−28 that has a percent abundance of 92.23 % and a mass of 27.977 amu, Si−29 that has a 4.68 % abundance and a mass of 28.976 amu, and Si-30 that has a percent abundance of 3.09 % and a mass of 29.974 amu. Calculate the atomic mass for silicon using the weighted average mass method.

Answer 1

(28 x 0.9223) + (29x0.0468)+(30 x 0.0309)= 28.1086