Question

030. The relative abundance of various isotopes of silicon
is as Si (28) = 92.25%, Si (29) = 4.65% and Si (30) =
3.10%. Calculate the average atomic mass of silicon.​

Answer 1

Answer: 28.1 amu

Explanation: Hi This is a very way questions if you know the formula that is.

Avg Atomic Mass= (Atomic mass of 1st isotope*percentage of abundance+ Atomic mass of 2nd isotope*percentage of abundance)/100

Now, for silicon, we get-Avg Atomic Mass= 92.23*28+4.67*29+3.10*30/100

= 2810.87/100

= 28.1 amu.

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