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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.

User Tala
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1 Answer

2 votes

Answer: The average atomic mass of naturally occurring silicon is 28.08

Step-by-step explanation:

Mass of isotope Si-28 = 27.9769265327

% abundance of isotope Si-28 = 92.2297% =
(92.2297)/(100)

Mass of isotope Si-29 = 28.97649472

% abundance of isotope Si-29 = (4.6932)% =
(4.6832)/(100)

Mass of isotope Si-30 = 29.97377022

% abundance of isotope Si-30 = (3.0872)% =
(3.0872)/(100)

Formula used for average atomic mass of an element :


A=\sum[(27.9769265327* (92.2297)/(100))+(28.97649472* (4.6832)/(100))+(29.97377022* (3.0872)/(100))]


A=28.08

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

User Ahbou
by
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