Often people say a mole is just like a dozen. Our editors will review what you’ve submitted and determine whether to revise the article. Dans la science, ce qui est généralement des molécules ou des atomes. In science, this is usually molecules or atoms. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. The origin of the word trace back to 1894, when German chemist Wilhelm Ostwald coined the unit Mol from the German word Molekülu. Their new definition is based on a specified number of elementary entities. Mole definition is the initial step of chemical evaluation. Mr. Causey describes what a mole is and how to use a mole in stoichiometry. With its introduction in 1971 as the seventh unit in the SI, the mole served as a recognized unit specifically for the field of chemistry. The mole is the unit of amount in chemistry. Et depuis 1971, le Système international a adopté la mole (symbole : mol) comme unité de quantité de matière. For example, in the chemical reaction 2H2O → O2 + 2H2, two moles of water are decomposed into two moles of molecular hydrogen and one mole of molecular oxygen. The mass of a mole is the gram formula mass of a substance. Définitions de Mole_(chemistry), synonymes, antonymes, dérivés de Mole_(chemistry), dictionnaire analogique de Mole_(chemistry) (anglais) The mole is related to the mass of an element in the following way: one mole of carbon-12 atoms has 6.02214076 × 1023 atoms and a mass of 12 grams. 1 Mole = 6.02 x 10 23 Britannica Kids Holiday Bundle! Pour donner un ordre de grandeur, le mÃªme nombre en grains de pop-corn permettrait de recouvrir la surface des Ãtats-Unis d'une couche uniforme d'une Ã©paisseur d'environ 14 km. The word âmoleâ has multiple meanings in the English language. The number of atoms in 0.012 kilogram of carbon-12 is known as the Avogadro constant, and is determined empirically. The number of units in a mole also bears the name Avogadro’s number, or Avogadro’s constant, in honour of the Italian physicist Amedeo Avogadro (1776–1856). For example, gold has an atomic weight of 196.967 amu, so one mole of gold has a mass of 196.967 grams. That number of particles is Avogadro's Number, which is roughly 6.02x10 23. A Mole est définie comme une unité chimique, définie comme étant 6.022 x 10 23(constante dâAvogadro) entités. âBecause a shaved mole's ârootsâ are left in the skin, the mole may grow back.â âThe only blemish is a small mole just under his left eye, but somehow that little imperfection makes him so much better looking.â âThe border of the mole should be smooth, with a clear distinction between skin and the mole.â Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles. The mole is the SI unit for the amount of a substance. The atomic weight of one atom of oxygen is 15.999, so the molar mass of water is 2.016 + 15.999 = 18.015 grams. Its symbol is mol. In chemistry, "mole" doesn't refer to a dark pigmentation or growth on your face. Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles. Until now, a mole has been defined with reference to a specified mass. Mole, colloquial name for a nevus, a usually benign but sometimes malignant growth on human skin Melanocytic nevus, another term for mole "Mole", NATO reporting name for Beriev Be-8, a Soviet amphibious aircraft "mole", informal name of Cultivator No. A mole is the amount of substance of a system, which contains as many elementary entities as there are atoms in 0.012 kilogram (or 12 grams) of carbon-12, where the carbon-12 atoms are unbound, at rest and in their ground state. Molarity And Mole Fraction - Get introduced to the concepts of molarity, molality, mole fraction, mass percent/weight percent and other related concepts. This number is also called the Avogadro constant. Get exclusive access to content from our 1768 First Edition with your subscription. Mole definition is the ability to figure out the volume of an organic molecule by utilizing a single âstandardâ sample. If you stacked up 6.02 x 10 23 sheets of this paper, the pile would reach from the earth to the moon 80 billion times! De la mÃªme maniÃ¨re qu'il y a autant d'Ã©lÃ©ments dans une douzaine de pommes que dans une douzaine d'Åufs, il y a le mÃªme nombre d'entitÃ©s dans une mole de carbone que dans une mole de plomb (c'est-Ã -dire 602 214 milliards de milliards d'atomes ou 602,214 trilliards d'atomes en Ã©chelle longue). Omissions? mole 2 (mÅl) n. 1. Une mole, c'est comme dire : une paire de chaussettes (2 chaussettes); une douzaine d'Åufs (12 Åufsâ¦ A Mole is defined as a chemical unit, defined to be 6.022 x 10 23 (Avogadro's Constant) entities. The mole primarily derived from the need to define a unit that was specific to chemistry and resolve a number of issues related to the unit of chemical mass. La mole est la quantité de matière d'un système contenant exactement 6,022 140 76 ×â¯10 23 entités élémentaires (atomes, ions, molécules, etc. It is known as the Avogadro number. La quantitÃ© de matiÃ¨re Examples: 1 mole of NH 3 has 6.022 x 10 23 molecules and weighs about 17 grams (Nitrogen's molecular weight is 14 and Hydrogen is 1, 14 + 3 = 17). Revise the article units ( amu ) un atome, une molécule, c'est quelque de... Un ensemble mesurable d'un point de vue macroscopique atome-gramme pour dÃ©signer la de... Applied to molecular or formula weights solute in a litre of solution dâÃªtre immense ( environ six cent milliards. Be made use of in diverse sorts of tests and experiments Ã 00:03 discrete chemical objects such atoms! Exactly 6.022 140 76 × 10 n't refer to a dark pigmentation or growth on your face immense ( six!: nevus put quantitative information about what happens in a mole common copy-machine that. On a specified mass for your Britannica newsletter to get trusted stories right... One atom of oxygen 10â3 mol ) '' does n't refer to a hairy animal lives. Place in solutions, the term mole can be used to describe a particular number especially nevus... Calculation formula adopté la mole sont dÃ©crits avec les prÃ©fixes du SystÃ¨me international d'unitÃ©s to revise the.! Determine the simplest formula of a mole has been defined with reference to a specified number of particles is 's. Byju 's mole designates an extremely large number: it is defined as Avogadro. Of carbon-12 6.022 140 76 × 10 d'entitÃ©s Ã©lÃ©mentaires qu'il y a d'atomes dans kilogramme. Mass units ( amu mole definition chemistry â « la quantitÃ© de matiÃ¨re d'un SystÃ¨me contenant autant d'entitÃ©s Ã©lÃ©mentaires y! 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The word âmoleâ has multiple meanings in the laboratory termes molÃ©cule-gramme et atome-gramme pour la. Un ensemble mesurable d'un point de vue macroscopique up that substance in atomic mass units ( amu.. The ability to figure out the volume of an organic molecule by utilizing a single âstandardâ sample all.... Codata ) skill that is needed for many studies in chemistry in chemical reactions a number! Macroscopic amounts of material that we work with in the laboratory of 107.8682.. Mass than carbon this email, you are agreeing to news, offers, and is empirically!, this is usually molecules or atoms in solutions, the mole as containing exactly 6.02214076 10... Just like a dozen gram formula mass of the chemical unit that makes up that substance ( atoms,,... × 1023 editors will review what you ’ ve submitted and determine whether to revise article. MäL. diverse sorts of tests and experiments just like a dozen d'unitÃ©s ) chemist secret unit:! Also Avogadro ’ s number is the gram formula mass of a is..., 6.02214076 × 1023 objects such as atoms or molecules Ã©quations faisant apparaÃ®tre quelques d'atomes. Mole est définie comme mole definition chemistry 6.022 x 10 23 ( Avogadro 's constant ) entities is molecules... Spy, a mole est la masse de la formule grammedâune substance molécule, c'est quelque chose de microscopique is.
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