2 years ago

Please help I will mark brainliest

Chemistry

1 answer:

Lubov Fominskaja [6]2 years ago

8 0

Explanation:

light blue is the answer second one

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An element has an atomic mass of 69.66 amu. It has two

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Answer: 63.26%

Explanation:

If we let the abundance of the first isotope be x, then:

$69.66=(68.9255)(x)+(70.9247)(1-x)\\69.66=68.9255x+70.9247-70.9247x\\-1.2647=-1.9992x\\x=\frac{-1.2647}{-1.9992} \approx 0.6326$

Which is equal to <u>63.26%</u>

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