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formulaIn chemistry, a representation of a molecule, radical, or ion, in which the component chemical elements are represented by their symbols. For example, the formula for carbon dioxide is CO2, showing that a molecule of carbon dioxide consists of one atom of carbon (C) and two atoms of oxygen (O2). An empirical formula indicates the simplest ratio of the elements in a compound, without indicating how many of them there are or how they are combined. A molecular formula gives the number of each type of element present in one molecule. A structural formula shows the relative positions of the atoms and the bonds between them. For example, for ethanoic (acetic) acid, the empirical formula is CH2O, the molecular formula is C2H4O2, and the structural formula is CH3COOH.
formulaIn mathematics, a set of symbols and numbers that expresses a fact or rule. For example, A = πr2 is the formula for calculating the area of a circle. E = mc2 is Einstein's famous formula relating energy and mass. Other common formulae exist for density, mass, volume, and area.
formula
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