What are the empirical formulas of the compounds with the...

What are the empirical formulas of the compounds with the following compositions?
(a) 40.1 percent C, 6.6 percent $H, 53.3$ percent $O ;$
(b) 18.4 percent $C$, 21.5 percent $\mathrm{N}, 60.1$ percent $\mathrm{K}$

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Key Concepts

Percent Composition

Percent composition is the representation of the mass of each element in a compound as a percentage of the total mass. It is used as the starting point in determining the empirical formula, by allowing the assumption of a convenient total mass (often 100 grams) so that the mass percentages can be directly interpreted as grams per 100 grams of the compound.

Conversion from Mass to Moles

Converting mass percentages to moles involves dividing the mass of each element by its atomic weight. This step transforms the mass data into moles, which are necessary for comparing the amounts of different elements on a common basis and determining the simplest whole-number ratio among them.

Empirical Formula Determination

Empirical formula determination is the process of finding the simplest whole-number ratio of the elements in a compound. This involves converting the given mass percentages or masses of each element to moles by dividing by their atomic masses, and then simplifying the mole ratios to integer values. The resulting formula represents the most reduced form of the compound’s composition.

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