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Makovka662 [10]
3 years ago
7

I don’t understand this page, can someone help?

Chemistry
1 answer:
cestrela7 [59]3 years ago
8 0

12. V.
13. W.
14. A.
15. R.
16. N.
17. X/Y
18.X/Y
19. M.
20. O.
21. W.
22. I.
23. U.
24. T.
25. P.



————
I believe that is all right
Sorry if not, Gl!
By the way, the ones that are “X/Y”
are the same answer so just put either X or Y.
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if you are given one element name and % by mass, how do you find the other element in the compound? give example plz
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The percentage of elements in the compound is determined from the number of elements in the compound

<h3>Further explanation  </h3>

Proust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements

\tt \%A~in~A_xB_y=\dfrac{x\times Ar~A}{MW~A_xB_y}\times 100\%

\tt \%B~in~A_xB_y=\dfrac{y\times Ar~B}{MW~A_xB_y}\times 100\%

Example

% Lithium (Li) in Li₂CO₃(lithium carbonate)

Ar of Li = 6.941 g/mol

MW of  Li₂CO₃  = 73.891 g/mol

\tt \%Li=\dfrac{2.Ar~Li}{MW~Li_2CO_3}\times 100\%\\\\\%Li=\dfrac{2\times 6.941}{73.891}\times 100\%=18.79\%

 

 

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what are the answers?

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