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OpenStudy (anonymous):
Naturally occurring silicon has an atomic mass of 28.086 and consists of three isotopes. The major isotope is 28Si , natural abundance 92.23%, relative atomic mass 27.97693. The next most abundant isotope is 29Si , relative atomic mass 28.97649. The third isotope is 30Si whose natural abundance is in the ratio of 0.6592 to that of 29Si. Find the relative atomic mass of 30Si
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OpenStudy (anonymous):
This is essentially a weighted percentages problem. If I have a final mass m, and it is made of of percentages of mass A, B and C, then: m = (%A * mass of A) + (%B * mass of B) + (%C * mass of C) Make sure you use the decimal form of the percentage in your calculations, i.e. that 78% = .78. Does that help?
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