Naturally occurring silicon consists of three isotopes with the following isotopic masses and abundances. IsotopeIsotopic mass (u)Abundance (%) 28 Si 27.9769265327 92.2297 29 Si 28.97649472 4.6832 30 Si 29.97377022 3.0872 Calculate the average atomic mass of naturally occurring silicon to at least four significant figures.

The average atomic mass  of naturally occurring silicon  is 28.08

Explanation:

Mass of isotope Si-28 = 27.9769265327

% abundance of isotope Si-28 = 92.2297% =

Mass of isotope Si-29 = 28.97649472

% abundance of isotope Si-29 = (4.6932)% =

Mass of isotope Si-30 = 29.97377022

% abundance of isotope Si-30 = (3.0872)% =

Formula used for average atomic mass of an element :

Therefore, the average atomic mass  of naturally occurring silicon  is 28.08