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moutchyjoseph
21.12.2020 •
Chemistry
What is the empirical formula for a compound that is comprised of 54.0% sodium, 8.50% boron, and 37.5% oxygen by mass?
A) Na2B2O3.
B) Na3BO3.
C) Na3B2O2.
D) Na4BO4.
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Ответ:
B) Na3BO3.
Explanation:
Hello!
In this case, since percent compositions are used to identify the empirical formula of an unknown compound, we can assume we have 54.0 g of sodium, 8.50 g of boron and 37.5 g of oxygen, and we compute the moles of each one:
Now, we divide by the moles of boron as those are the fewest:
Thus, the empirical formula is B) Na3BO3.
Best regards!
Ответ:
Hi There the correct answer to this is They are all related by one important equation: Any electromagnetic wave's frequency multiplied by its wavelength equals the speed of light.
Hope this helps!