Average atomic mass of silicon?

Hello, I was wondering how do you find out these answers and what are the answers?

25. A: Given the following data, calculate the average atomic mass of silicon.

isotope = Si-28
amu =27.9769
abundance(%) =92.18

isotope = Si-29
amu =28.9765
abundance(%) =4.71

isotope =Si-30
amu =29.9738
abundance(%) =3.12

Thank you! : )

Multiply each percent abundance the corresponding amu and add all three values together. You should get an answer close to 28.0855 amu.

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RE:
Average atomic mass of silicon?
Hello, I was wondering how do you find out these answers and what are the answers?

25. A: Given the following data, calculate the average atomic mass of silicon.

isotope = Si-28
amu =27.9769
abundance(%) =92.18

isotope = Si-29
amu =28.9765
abundance(%) =4.71

isotope…

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