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Problem Answer

The percentage analysis leads to the molar ratio: 0.972 Mn : 2.92 O. This molar ratio reduces to the integer ratio of the formula: MnO3.


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Calculate Stoichiometry Expression

Calculating Empirical Formula

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Background

The mole concept is a convenient mathematics construct that follows logically from the atomic theory. At the most basic level, moles can be used for comparing relative numbers of atoms or molecules. Answering the question below involves a simple conversion of grams into moles for each element. Textbook Discussion: Section 5.7, page 119. See Also: Example VI, page 121; Problem 32, page 148.

Problem

Qualitative analysis indicates that a certain chemical compound contains only the elements manganese and oxygen. A quantitative analysis of the compound reveals that the compound contains 53.4 percent manganese. What is the empirical formula of this compound? Atomic Masses: Mn=54.9 O=16.0 amu.

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