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yulyashka [42]
3 years ago
15

How do you do these?

Chemistry
1 answer:
Agata [3.3K]3 years ago
6 0

Solve these problems like weighted averages:

The first one:

Multiply the masses (isotope numbers) by the decimal form of the percentage. Add them

0.076 (6) + 0.924 (7) = 6.924


The second one:

0.2 (10) + 0.8 (11) = 10.8


If you think about it, these answers make sense. 6.924 is much closer to 7 than to 6 (since there's a lot more lithium-7 than there is lithium-6). 10.8 is closer to 11 than to 10.


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Answer: 2.88×10^{24}atoms P_{2}O_{5}

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