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08.12.2020 •
Chemistry
. Analysis of a compound finds it contains 25.0% of species X, by mass, and 75.0% of species Y by mass. The molar mass of species X is 25.0 g/mol, and the molar mass of species Y is 150. g/mol. If the molar mass of the compound is 600. g/mol, what is the molecular formula of the compound
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Ответ:
Molecular formula is: X₆Y₃
Explanation:
First of all we think in centesimal composition:
25 % of X and 75 % of Y
This means, that in 100 g of compound we have 25 g of X and 75 g of Y.
Therefore, our compound is: XY
To determine the moles, we divide the % by the molar mass of each
25 g / 25 g/mol = 1 X
75 g / 150 g/mol = 0.5 Y
As we can not have decimal numbers we mutiply x2.
X₂Y
This is the empirical formula, which is not the same as molecular one. We calculated from 100 g of compound so now we finish the excersise by rules of three:
In 100 g of compound we have 1 moles of X
In 600 g we must have (600 . 1)/100 = 6 X
In 100 g of compound we have 0.5 mol of Y
In 600 g we must have (600 . 0.5)/100 = 3 Y
Molecular formula is: X₆Y₃
We can confirm it by the molar mass:
25 g/mol . 6 + 150 g/mol . 3 = 600 g/mol
Ответ:
b
Explanation:
it is impossible for n & l to be equal