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konstantin123 [22]
3 years ago
11

Please Help Me on this!!!! I'll Mark Brainliest!!!!! Thanks!!!!!!

Chemistry
2 answers:
makvit [3.9K]3 years ago
8 0

Answer:

15.999amu

Explanation:

There is way more O16 than any other, so O17 and O18 affect it very little.

Stella [2.4K]3 years ago
5 0

Answer:

The answer is 15.999 amu

Explanation:

Data:

mO16 = 15.995 amu

mO17 = 16.999 amu

mO18 = 17.999 amu

%O16 = 99.757%

%O17 = 0.038%

%O18 = 0.205%

The molecular mass of oxygen is going to be equal to:

mO = \frac{(mO16xpercentO16)+(mO17xpercentO17)+(mO18xpercentO18)}{100}

replacing, we have:

mO = \frac{(15.995x99.757)+(16.999x0.038)+(17.999x0.205)}{100} = 15.999489 amu

this is approximately 15.999 amu

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