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Basile [38]
3 years ago
9

PLEASE HELP I HAVE 19 MINUTES LEFT I WILL MARK BRAINLIEST

Chemistry
2 answers:
kenny6666 [7]3 years ago
7 0

Answer:

316.227766

Explanation:

lidiya [134]3 years ago
3 0
Answer 3.16 hope it helps
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Isotope Atomic Mass (amu) Percent Abundance
exis [7]

Answer:

The average atomic mass is closer to Si- 28 because this isotope is present in more percentage in the sample.

Explanation:

Given data:

Atomic mass of silicon= ?

Percent abundance of Si-28 = 92.21%

Atomic mass of Si-28 = 27.98 amu

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Atomic mass of  Si-29 = 28.98 amu

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Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)+(abundance of 2nd isotope × its atomic mass)  / 100

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Average atomic mass  = 28.08amu.

The average atomic mass is closer to Si- 28 because this isotope is present in more percentage in the sample.

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