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In chemistry, the empirical formula of a chemical compound is the simplest positive integer ratio of atoms present in a compound. A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S2O2. This means that sulfur monoxide and disulfur dioxide, both compounds of Sulfur and Oxygen will have the same empirical formula. An empirical formula makes no mention of the arrangement or number of atoms. It is standard for many ionic compounds, like CaCl2, and for macromolecules, such as SiO2. The molecular formula, on the other hand, shows the number of each type of atom in a molecule. Also the structural formula shows the arrangement of the molecule. It is possible for different types of compounds to have equal empirical formulas. == Examples == * Glucose (), ribose (), acetic acid (), and formaldehyde () all have different molecular formulas but the same empirical formula: . This is the actual molecular formula for formaldehyde, but acetic acid has double the number of atoms, ribose has five times the number of atoms, and glucose has six times the number of atoms. * The chemical compound n-hexane has the structural formula , which shows that it has 6 carbon atoms arranged in a chain, and 14 hydrogen atoms. Hexane's molecular formula is , and its empirical formula is , showing a C:H ratio of 3:7. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「empirical formula」の詳細全文を読む スポンサード リンク
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