Calculate the atomic mass of silicon, which occurs naturally as 92% silicon-
28, 5% silicon-29, and 3% silicon-30.

28.11g Si

Explanation:

There is a whole formula for this.

Atomic mass= (Percent Abundance* relative isotope mass) + (percent abudance*relative isotope mass) + (Percent Abundance*relative isotope mass)

(0.92*28)+(0.05*29)+(0.03*30)= 28.11g

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