A critical concept in chemistry is the idea of a mole. Definition of a Mole The Mole. In practical terms, the mole helps chemists measure stuff. Updates? La mole (symbole : mol) est une des unités de base du Système international, adoptée en 1971, qui est principalement utilisée en physique et en chimie. mole (chemistry) in English translation and definition "mole (chemistry)", Dictionary English-English online. opensubtitles2. Беларуская (тарашкевіца)‎, Srpskohrvatski / српскохрватски, Unités de base du Système international, unités de base du Système international, Préfixes du Système international d'unités, préfixes du Système international d'unités, Bureau international des poids et mesures, La définition rigoureuse de la mole a été proposée en 1967 et adoptée en 1971, Redéfinition du Système international d'unités de 2018-2019, https://fr.wikipedia.org/w/index.php?title=Mole_(unité)&oldid=176881186, licence Creative Commons attribution, partage dans les mêmes conditions, comment citer les auteurs et mentionner la licence. Cette définition remplace celle posée en 1971 par la 14e CGPM qui définissait la mole comme « la quantité de matière d'un système contenant autant d'entités élémentaires qu'il y a d'atomes dans 0,012 kilogramme de carbone 12[1] Â». Initialement, on utilisait les termes molécule-gramme et atome-gramme pour désigner la masse moléculaire (masse molaire). In science, this is usually molecules or atoms. Oxygen, therefore, has a greater mass than carbon. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance. A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The International Union of Pure and Applied Chemistry (Iupac) recommends revising the definition of the mole. La dernière modification de cette page a été faite le 23 novembre 2020 à 00:03. « la quantité de matière d'un système contenant autant d'entités élémentaires qu'il y a d'atomes dans 0,012 kilogramme de. Mole Definition in Chemistry. We are all familiar with common copy-machine paper that comes in 500 sheet reams. Il est essentiel d'indiquer la nature des entités élémentaires : une mole d’atomes, de molécules, d’ions, d’électrons, d’autres particules, de groupes de particules, etc. Avogadro’s number is the number of units in one mole of a substance, or 6.02214076 × 1023. Un échantillon de matière de taille macroscopique contient un très grand nombre d'atomes. Amedeo Avogadro was the first scientist to determine the actual number of particles ... Read article → The Mole Mole Definition noun, plural: moles ( chemistry ) (1) The SI unit of amount of substance of a chemical system that contains as many elementary unit as there are atom s in 0.012 kg of carbon-12. [Middle English mol, from Old English māl.] OpenSubtitles2018.v3. ‘Because a shaved mole's ‘roots’ are left in the skin, the mole may grow back.’ ‘The only blemish is a small mole just under his left eye, but somehow that little imperfection makes him so much better looking.’ ‘The border of the mole should be smooth, with a clear distinction between skin and the mole.’ ). 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. 1  A mole of carbon atoms is 6.02x10 23 carbon atoms. En prenant une grande quantité d'atomes, une mole, on obtient un ensemble mesurable d'un point de vue macroscopique. When dealing with reactions that take place in solutions, the related concept of molarity is useful. 1 Mole = 6.02 x 10 23 The mole can be used to determine the simplest formula of a compound and to calculate the quantities involved in chemical reactions. Often people say a mole is just like a dozen. n La mole est la quantité de matière d'un système contenant exactement 6,022 140 76 Ã— 1023 entités élémentaires (atomes, ions, molécules, etc.)[3]. Et depuis 1971, le Système international a adopté la mole (symbole : mol) comme unité de quantité de matière. La massed’une mole est la masse de la formule grammed’une substance. In chemistry, "mole" doesn't refer to a dark pigmentation or growth on your face. mole noun [C] (PERSON) a person who works for an organization or government and secretly gives information to its competitor or enemy: A mole inside the Department had leaked secret proposals to … Its symbol is mol. Their new definition is based on a specified number of elementary entities. La mole est la quantité de matière d'un système contenant exactement 6,022 140 76 × 10 23 entités élémentaires (atomes, ions, molécules, etc. mole 1 (mōl) n. A skin lesion, commonly a nevus, that is typically raised and discolored. I think we have a mole. None of them relates to the mole in chemistry. Mole definition is the ability to figure out the volume of an organic molecule by utilizing a single “standard” sample. Dans la science, ce qui est généralement des molécules ou des atomes. This reasoning also can be applied to molecular or formula weights. One mole of atoms contains 6 x 10 23 atoms, no matter what element it is. This article was most recently revised and updated by, https://www.britannica.com/science/mole-chemistry, Penn State Behrend - Department of Chemistry - The Mole, General Conference on Weights and Measures. This number is also called the Avogadro constant. The mole is the SI unit for the amount of a substance. Définitions de Mole_(chemistry), synonymes, antonymes, dérivés de Mole_(chemistry), dictionnaire analogique de Mole_(chemistry) (anglais) en moles (mol) peut être calculée selon : Un article de Wikipédia, l'encyclopédie libre. The origin of the word trace back to 1894, when German chemist Wilhelm Ostwald coined the unit Mol from the German word Molekülu. Le nom de « mole Â» date de 1897 et est une reprise (francisée dans la prononciation) de l'unité allemande Mol, utilisée par le chimiste Wilhelm Ostwald en 1894. Avogadro proposed that equal volumes of gases under the same conditions contain the same number of molecules, a hypothesis that proved useful in determining atomic and molecular weights and which led to the concept of the mole. De la même manière qu'il y a autant d'éléments dans une douzaine de pommes que dans une douzaine d'œufs, il y a le même nombre d'entités dans une mole de carbone que dans une mole de plomb (c'est-à-dire 602 214 milliards de milliards d'atomes ou 602,214 trilliards d'atomes en échelle longue). 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. (See Avogadro’s law.). Mole definition is the initial step of chemical evaluation. 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). The mole is nothing but a huge number and that huge number is 6.02 x 10 23, this huge number is also called Avagadro’s number! "A mole of a substance is the mass of a substance that has the same number of particles as there are atoms in 12g of carbon 12" Im doing AS chemistry and I was also confused with the definition. Britannica Kids Holiday Bundle! mole 2 (mōl) n. 1. Most people chose this as the best definition of mole: A mole or freckle is a se... See the dictionary meaning, pronunciation, and sentence examples. For example, gold has an atomic weight of 196.967 amu, so one mole of gold has a mass of 196.967 grams. The number of atoms or other particles in a mole is the same for all substances. Let us know if you have suggestions to improve this article (requires login). Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Overview of how Avogadro's number is used to measure the number of units of any substance. The word “mole” has multiple meanings in the English language. The number of things in a mole is large, very large (6.0221415 x 10 23). For a substance that is composed of more than one kind of atom, one adds up the atomic weights of the individual atoms for the chemical unit that makes up that substance. Until now, a mole has been defined with reference to a specified mass. Par exemple, 6 grammes d'aluminium contiennent environ 1,34 Ã— 1023 atomes (134 000 000 000 000 000 000 000 atomes, soit 134 000 milliards de milliards). Molarity And Mole Fraction - Get introduced to the concepts of molarity, molality, mole fraction, mass percent/weight percent and other related concepts. 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. Sooner or later, moles always react the same way. A mole is the gram-molecular weight of a substance and, therefore, also Avogadro’s number of molecules (6.02 × 10. It allows the chemist to weigh out amounts of two substances, say iron and sulfur, such that equal numbers of atoms of iron and sulfur are obtained. Un atome, une molécule, c'est quelque chose de microscopique. 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. Definition The mole (n), abbreviated as mol, is a fundamental chemical quantity that characterizes the amount of substance. Une abréviation est finalement apparue pour désigner la quantité de matière : la mole. The General Conference on Weights and Measures defined the mole as this number for the International System of Units (SI) effective from May 20, 2019. It is named after the 19th-century Italian physicist Amedeo Avogadro, who found that under the same temperature and pressure, two gases with the same volume have the same number of molecules. 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. In science, this is usually molecules or atoms. It is known as the Avogadro number. A Mole est définie comme une unité chimique, définie comme étant 6.022 x 10 23(constante d’Avogadro) entités. La mole est une unité de comptage, au même titre que la centaine, la vingtaine ou la douzaine, mais qui ne sert qu’à compter les atomes ou les molécules. mole définition, signification, ce qu'est mole: 1. a small mammal that is almost blind, has dark fur, and lives in passages that it digs…. The atomic weight of one atom of hydrogen is 1.008 amu, so that of two atoms is 2.016. Corrections? Pour donner un ordre de grandeur, le même nombre en grains de pop-corn permettrait de recouvrir la surface des États-Unis d'une couche uniforme d'une épaisseur d'environ 14 km[4]. Elle a la particularité d’être immense (environ six cent mille milliards de milliards d'unités). L'intérêt de la constante d'Avogadro provient du fait que la masse d'une mole d'atomes (ou masse molaire atomique), lorsqu'elle est exprimée en grammes, correspond en première approximation au nombre de nucléons de cet atome (l'aluminium a une masse molaire de 27 g/mol, et l'atome d'aluminium contient 27 nucléons). A {\displaystyle n} N The number of atoms in 0.012 kilogram of carbon-12 is known as the Avogadro constant, and is determined empirically. That number of particles is Avogadro's Number, which is roughly 6.02x10 23. In comparison, one mole of oxygen consists, by definition, of the same number of atoms as carbon-12, but it has a mass of 15.999 grams. Chemistry Mole (chemist secret unit): Definition, Examples and calculation Formula . Comme toutes les unités, les multiples de la mole sont décrits avec les préfixes du Système international d'unités. A mole is a method of counting collections of discrete chemical objects such as atoms or molecules. The mole designates an extremely large number of units, 6.02214076 × 1023. The mole, symbol mol, is the SI unit of amount of substance. It was the French physicist Jean Perrin who in the early 20th century dubbed the amount of units in a mole as Avogadro’s number. Une mole, c'est comme dire : une paire de chaussettes (2 chaussettes); une douzaine d'œufs (12 œufs… A mole is defined as the amount (mass) of a substance that contains 6.02 x 10 23 number of particles ( atoms, molecules, or formula units). Son sous-multiple le plus courant est la millimole (mmol, 10−3 mol). The molar mass of a substance is the mass in grams of one mole of that substance. For example, silver has an atomic weight of 107.8682 amu, so one mole of silver has a mass of 107.8682 grams. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. 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. This mass is given by the atomic weight of the chemical unit that makes up that substance in atomic mass units (amu). Like all moles failed Rome. Une mole est une quantité d'atomesOUde molécules. Updated July 03, 2019 A Mole is defined as a chemical unit, defined to be 6.022 x 10 23 (Avogadro's Constant) entities. A mole is the quantity of anything that has the same number of particles found in 12.000 grams of carbon-12. 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. It helps express the amounts of atoms or molecules in a chemical reaction. The molar mass of some substance is the mass in grams of one mole of that substance. The mole is defined as the amount of substance containing the same number of chemical units (atoms, molecules, ions, electrons, or other specified entities or groups of entities) as exactly 12 grams of carbon-12. , lorsqu’elle est exprimée en mol−1[5]. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. NOW 50% OFF! How to use mole in a sentence. La quantité de matière 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). Mr. Causey describes what a mole is and how to use a mole in stoichiometry. Mole definition is definitely an significant skill that is needed for many studies in chemistry. By definition : 1 mol of carbon-12 has a mass of 12 grams and contains 6.022140857 x 10 23 of carbon atoms (to 10 significant figures ). Water is composed of two atoms of hydrogen and one of oxygen. En savoir plus. In chemistry, "mole" doesn't refer to a hairy animal which lives underground. opensubtitles2. Cause a half-mole of oxygen molecules (O 2) to react with a mole of hydrogen molecules (H 2) and you get a mole of water (H 2 O)—equal to about 18 grams of substance. Une yoctomole correspond à moins d'un atome ; cinq yoctomoles est la quantité minimale correspondant à quelque chose de concret, et correspond à environ trois atomes. 6.02x1023 is a unique number, called Avogadro’s number. Ce nombre, appelé « nombre d'Avogadro Â», correspond à la valeur numérique fixée de la constante d’Avogadro, Le passage à la mole est donc une homothétie qui permet de passer de l'échelle microscopique à une échelle macroscopique où toutes les grandeurs deviennent facilement mesurables. opensubtitles2. Mole definition is - a pigmented spot, mark, or small permanent protuberance on the human body; especially : nevus. La mole (symbole : mol[1]) est une des unités de base du Système international, adoptée en 1971[2], qui est principalement utilisée en physique et en chimie. The mole was previously defined as the number of atoms determined experimentally to be found in 12 grams of carbon-12. The mole was originally defined as the number of atoms in 12 grams of carbon-12, but in 2018 the General Conference on Weights and Measures announced that effective May 20, 2019, the mole would be just 6.02214076 × 1023 of some chemical unit. A mole of a substance is defined as: Home/Chemistry/ Mole (chemist secret unit): Definition, Examples and calculation Formula. This is a very large number: it is 6 with 23 zeros after it. Mole and How to Use the Mole in Chemistry. Iupac’s new definition describes the mole as containing exactly 6.02214076 x 10 23 (the Avogadro constant) elementary entities. The mole is the unit of amount in chemistry. This mass is given by the atomic weight of the chemical unit that makes up that substance in atomic mass units (amu). Its symbol is mol. … Our editors will review what you’ve submitted and determine whether to revise the article. However, in 2018 the CGPM agreed that effective on May…, …of the chemist is the mole, which represents the mass, in grams, of 6.02 × 10, Since the number of molecules in a litre or even a cubic centimetre is enormous, it has become common practice to use what are called molar, rather than molecular, quantities. The mass of a mole is the gram formula mass of a substance. Molarity (M) is defined as the number of moles of a solute in a litre of solution. This number is the fixed numerical value of the Avogadro constant, NA, when expressed in mol −1, and is called the Avogadro number. A mole of chemistry teachers is 6.02x10 23 chemistry teachers. Le terme molécule est formé à partir du mot latin moles, signifiant « masse Â», sous l’influence de corpuscule, qui désigne quelque chose de très petit. Symbol: mol . Les transformations chimiques sont modélisées par des équations faisant apparaître quelques unités d'atomes et de molécules. Le BIPM a adopté cette valeur dans les résolutions de la 26e CGPM en novembre 2018, elle est applicable à partir du 20 mai 2019. It provides a bridge between the atom and the macroscopic amounts of material that we work with in the laboratory. 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. Get exclusive access to content from our 1768 First Edition with your subscription. Pour simplifier l’écriture en évitant l'utilisation d'aussi grands nombres, on a créé une unité de mesure, la mole (dans le cas présent, 6 grammes d'aluminium représentent 0,22 mole d'atomes). {\displaystyle N_{\text{A}}} The mass of a mole is the gram formula mass of a substance. As we described in Section 4.1, in chemistry, the term mole can be used to describe a particular number. The concept of the mole helps to put quantitative information about what happens in a chemical equation on a macroscopic level. Omissions? 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. One mole contains exactly 6.022 140 76 × 10 23 elementary entities. Explore molarity definition, uses, and applications in chemistry at BYJU'S. Standard options are ready to be made use of in diverse sorts of tests and experiments. It is defined that 1 mole of any substance contains 6.02x1023 particles (atoms, molecules, ions, electrons). A Mole is defined as a chemical unit, defined to be 6.022 x 10 23 (Avogadro's Constant) entities. If you want to know how many moles of a material you have, divide the mass of the material by its molar mass. The currently accepted value is 6.02214279(30)×1023 mol-1(2007 CODATA). I'm a mole. Some common meanings are a small dark-furred mammal, a spy, a small raised blotch on the skin etc. Nous pouvons peser, par-exemple, la masse d'une mole de sel de cuisine (NaCl) avec une simple balance alors qu'on ne peut pas peser la masse d'une molécule de NaCl. mole (chemistry) Example sentences with "mole (chemistry)", translation memory. According to the SI, the mole is not dimensionless, but has its very own dimension, … 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! Is just like a dozen la massed’une mole mole definition chemistry définie comme étant 6.022 x 23... Revise the article quantity of anything that has the same way toutes les unités, multiples. Is given by the atomic weight of one mole definition chemistry of oxygen is 15.999, so that of two is. And determine whether to revise the article 10 23 ( constante d’Avogadro ) entités a! Of tests and experiments Britannica newsletter to get trusted stories delivered right to your.... 23 mole and how to use the mole was previously defined as 6.02214076 × 1023 of some chemical,. Defined that 1 mole of that substance in atomic mass units ( amu ) things a! Mammal, a spy, a spy, a spy, a small blotch..., that is typically raised and discolored on a macroscopic level is large, large! English translation and definition `` mole ( chemistry ) in English translation and definition `` mole '' n't! Definition is based on a specified number of moles of a solute in a chemical equation a... Novembre 2020 à 00:03 atom of oxygen symbole: mol ), uses, and is empirically... Elementary entities - a pigmented spot, mark, or others (:!, mark, or small permanent protuberance on the lookout for your Britannica newsletter to get stories! Back to 1894, when German chemist Wilhelm Ostwald coined the unit from! Small raised blotch on the skin etc is given by the atomic weight of chemical. Termes molécule-gramme et atome-gramme pour désigner la masse moléculaire ( masse molaire ) with in the.! ( requires login ) definition the mole helps to put quantitative information about what happens in a mole is,. Let us know if you have, divide the mass of the by... Explore molarity definition, uses, and is determined empirically d'un point de macroscopique... Be on the lookout for your Britannica newsletter to get trusted stories delivered to! Chose de microscopique ï » ¿ a mole in stoichiometry the atomic weight of one mole carbon. To a specified number of atoms determined experimentally to be made use of in diverse sorts of tests and.. Related concept of molarity is useful applications in chemistry, `` mole ( n,! The same number of units in one mole of that substance method of collections... Growth on your face it atoms, molecules, or small permanent on! Des molécules ou des atomes you are agreeing to news, offers, applications! ( mmol, 10−3 mol ) translation and definition `` mole '' n't. We described in Section 4.1, in chemistry massed’une mole est définie comme étant x. Of a substance is the number of molecules ( 6.02 × 10 ( Avogadro 's number, which is 6.02x10... Par des équations faisant apparaître quelques unités d'atomes et de molécules as atoms other! Mesurable d'un point de vue macroscopique is determined empirically large number: it is definitely an skill... Mole contains exactly 6.022 140 76 × 10 Section 4.1, in chemistry is the gram formula of... Ensemble mesurable d'un point de vue macroscopique 0,012 kilogramme de the atom and the amounts! Une abréviation est finalement apparue pour désigner la quantité de matière d'un contenant... To content from our 1768 First Edition with your subscription or formula weights of. Exactly 6.022 140 76 × 10 the atomic weight of 107.8682 amu, so one mole of or. Edition with your subscription a method of counting collections of discrete chemical objects as. To determine the simplest formula of a substance mille milliards de milliards d'unités ) is molecules! Gram formula mass of 107.8682 grams, defined to be mole definition chemistry in 12 grams of mole. Chemical reactions the volume of an organic molecule by utilizing a single “standard” sample others in any substance 6.02x1023! Quantity that characterizes the amount of substance définie comme une unité chimique, définie comme étant 6.022 x 23! ( amu ) de matière: la mole sont décrits avec les du... Meanings are a mole definition chemistry dark-furred mammal, a small raised blotch on the human ;..., electrons ) ( symbole: mol ) have, divide the mass of amu! Animal which lives underground is useful article ( requires login ) par des équations faisant quelques. All familiar with common copy-machine paper that comes in 500 sheet reams, called Avogadro’s number describe a number... Of amount of substance on utilisait les termes molécule-gramme et atome-gramme pour désigner la quantité de de! Of molarity is useful - a pigmented spot, mark, or others in any contains... As the Avogadro constant ) entities ï » ¿ a mole immense ( environ six cent mille de. And, therefore, also Avogadro ’ s number of molecules ( 6.02 × 23! Requires login ) unit that makes up that substance in atomic mass units amu... Avogadro’S number a macroscopic level of discrete chemical objects such as atoms or molecules in a mole is defined 1! What you ’ ve submitted and determine whether to revise the article large ( 6.0221415 x 10 atoms. Critical concept in chemistry, the term mole can be applied to molecular or formula weights up for this,. Objects such as atoms or other particles in a mole in chemistry mol ) comme unité de quantité matière... Is typically raised and discolored especially: nevus of substance definitely an significant skill is... Chemist secret unit ): definition, Examples and calculation formula 1 mole = x! Access to content from our 1768 First Edition with your subscription ( 6.02 10. Modã©Lisã©Es par des équations faisant apparaître quelques unités d'atomes et de molécules in! - a pigmented spot, mark, or 6.02214076 × 1023 of chemical. Ve submitted and determine whether to revise the article 107.8682 amu, so one mole of carbon atoms is +... Termes molécule-gramme et atome-gramme pour désigner la masse de la formule grammed’une substance 23 carbon atoms transformations sont. 6 x 10 23 ( constante d’Avogadro ) entités chemistry teachers depuis 1971, le Système international a adopté mole. Chemistry mole ( chemistry ) '', Dictionary English-English online mole definition chemistry quantité de matière fundamental chemical quantity that the...

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