Silicon, which makes up about 25% of earth's crust by mass, is used widely in the modern electronics industry. it has three naturally occurring isotopes, 28si, 29si, and30si. calculate the atomic mass of silicon to 4 decimal places. isotope isotopic mass (amu) abundance (%) 28si 27.976927 92.23 29si 28.976495 4.67 30si 29.973770 3.10

Question

Chemistry

Kaia Shields

12 November, 00:25

Silicon, which makes up about 25% of earth's crust by mass, is used widely in the modern electronics industry. it has three naturally occurring isotopes, 28si, 29si, and30si. calculate the atomic mass of silicon to 4 decimal places. isotope isotopic mass (amu) abundance (%) 28si 27.976927 92.23 29si 28.976495 4.67 30si 29.973770 3.10

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Hezekiah Tran · Answer 1

Answer is: 28,0855 amu.

%abudance (²⁸Si) = 92,23% = 0,9223.

%abudance (²⁹Si) = 4,67% = 0,0467.

%abudance (³⁰Si) = 3,10 = 0,031.

isotopic mass (²⁸Si) = 27,967927 amu.

isotopic mass (²⁹Si) = 28,976495 amu.

isotopic mass (³⁰Si) = 29,973770 amu.

Ar (Si) = (27.976927 x 92.23) + (28.976495 x 4.67) + (29.973770 x3.10) / 100

= 28,0855 amu.