Asked by Rinad

Naturally occurring silicon exists as 3 isotopes: 28Si, 29Si, and 30Si, whose atomic masses are 27.9769, 28.9865, and 29.9838, respectively. The most abundant isotope is 28Si, which accounts for 92.23% of naturally occurring silicon. Given that the average atomic mass of silicon is 28.0855 amu, calculate the percentages of 29Si and 30Si in nature.


Please explain step by step
Answered by DrBob222
28Si = 92.23% and 27.9769 amu
29Si = X% and 28.9865 amu
30Si = 100%-92.23%-X% = 7.77%-X and 29.9838 amu
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(0.9223*27.9769)+(X)(28.9865)+(0.0777)(29.9838 = 28.0955

Solve for X and 7.77-X
Answered by Jemal mohammed
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