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. 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! Symbol: mol . , lorsqu’elle est exprimée en mol−1[5]. 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. 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). It is defined that 1 mole of any substance contains 6.02x1023 particles (atoms, molecules, ions, electrons). If you want to know how many moles of a material you have, divide the mass of the material by its molar mass. Get exclusive access to content from our 1768 First Edition with your subscription. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. The mole can be used to determine the simplest formula of a compound and to calculate the quantities involved in chemical reactions. 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). ). 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]. 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…. Elle a la particularité d’être immense (environ six cent mille milliards de milliards d'unités). In practical terms, the mole helps chemists measure stuff. A Mole est définie comme une unité chimique, définie comme étant 6.022 x 10 23(constante d’Avogadro) entités. The number of atoms in 0.012 kilogram of carbon-12 is known as the Avogadro constant, and is determined empirically. Corrections? The word “mole” has multiple meanings in the English language. La quantité de matière La dernière modification de cette page a été faite le 23 novembre 2020 à 00:03. n It helps express the amounts of atoms or molecules in a chemical reaction. Explore molarity definition, uses, and applications in chemistry at BYJU'S. Sooner or later, moles always react the same way. This mass is given by the atomic weight of the chemical unit that makes up that substance in atomic mass units (amu). opensubtitles2. The mole designates an extremely large number of units, 6.02214076 × 1023. OpenSubtitles2018.v3. 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. Often people say a mole is just like a dozen. The currently accepted value is 6.02214279(30)×1023 mol-1(2007 CODATA). (See Avogadro’s law.). The molar mass of a substance is the mass in grams of one mole of that substance. mole (chemistry) Example sentences with "mole (chemistry)", translation memory. NOW 50% OFF! It provides a bridge between the atom and the macroscopic amounts of material that we work with in the laboratory. Définitions de Mole_(chemistry), synonymes, antonymes, dérivés de Mole_(chemistry), dictionnaire analogique de Mole_(chemistry) (anglais) 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. The mass of a mole is the gram formula mass of a substance. 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). … Home/Chemistry/ Mole (chemist secret unit): Definition, Examples and calculation Formula. mole (chemistry) in English translation and definition "mole (chemistry)", Dictionary English-English online. 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. The concept of the mole helps to put quantitative information about what happens in a chemical equation on a macroscopic level. A mole is a method of counting collections of discrete chemical objects such as atoms or molecules. According to the SI, the mole is not dimensionless, but has its very own dimension, … 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. En prenant une grande quantité d'atomes, une mole, on obtient un ensemble mesurable d'un point de vue macroscopique. Mole definition is the ability to figure out the volume of an organic molecule by utilizing a single “standard” sample. 6.02x1023 is a unique number, called Avogadro’s number. 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. When dealing with reactions that take place in solutions, the related concept of molarity is useful. Dans la science, ce qui est généralement des molécules ou des atomes. That number of particles is Avogadro's Number, which is roughly 6.02x10 23. 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. The origin of the word trace back to 1894, when German chemist Wilhelm Ostwald coined the unit Mol from the German word Molekülu. A mole of a substance is defined as: How to use mole in a sentence. Its symbol is mol. Et depuis 1971, le Système international a adopté la mole (symbole : mol) comme unité de quantité de matière. In science, this is usually molecules or atoms. 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. {\displaystyle N_{\text{A}}} "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. 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]. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance. {\displaystyle n} Mole and How to Use the Mole in Chemistry. This number is the fixed numerical value of the Avogadro constant, NA, when expressed in mol −1, and is called the Avogadro number. Standard options are ready to be made use of in diverse sorts of tests and experiments. [Middle English mol, from Old English māl.] Like all moles failed Rome. Mole definition is definitely an significant skill that is needed for many studies in chemistry. ‘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.’ The number of atoms or other particles in a mole is the same for all substances. Omissions? Chemistry Mole (chemist secret unit): Definition, Examples and calculation Formula . 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. 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). The atomic weight of one atom of hydrogen is 1.008 amu, so that of two atoms is 2.016. Une abréviation est finalement apparue pour désigner la quantité de matière : la mole. As we described in Section 4.1, in chemistry, the term mole can be used to describe a particular number. Une mole est une quantité d'atomesOUde molécules. Our editors will review what you’ve submitted and determine whether to revise the article. A mole is the quantity of anything that has the same number of particles found in 12.000 grams of carbon-12. Some common meanings are a small dark-furred mammal, a spy, a small raised blotch on the skin etc. Une mole, c'est comme dire : une paire de chaussettes (2 chaussettes); une douzaine d'œufs (12 œufs… This number is also called the Avogadro constant. For example, gold has an atomic weight of 196.967 amu, so one mole of gold has a mass of 196.967 grams. None of them relates to the mole in chemistry. A In science, this is usually molecules or atoms. 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. A mole is the gram-molecular weight of a substance and, therefore, also Avogadro’s number of molecules (6.02 × 10. The mole, symbol mol, is the SI unit of amount of substance. 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. The International Union of Pure and Applied Chemistry (Iupac) recommends revising the definition of the mole. 1 Mole = 6.02 x 10 23 This mass is given by the atomic weight of the chemical unit that makes up that substance in atomic mass units (amu). 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. 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 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! 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. 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 ). 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. 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 2 (mōl) n. 1. 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. Let us know if you have suggestions to improve this article (requires login). Un atome, une molécule, c'est quelque chose de microscopique. 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. Its symbol is mol. en moles (mol) peut être calculée selon : Un article de Wikipédia, l'encyclopédie libre. A critical concept in chemistry is the idea of a mole. 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. Water is composed of two atoms of hydrogen and one of oxygen. 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. A Mole is defined as a chemical unit, defined to be 6.022 x 10 23 (Avogadro's Constant) entities. Britannica Kids Holiday Bundle! The mole is the unit of amount in chemistry. One mole of atoms contains 6 x 10 23 atoms, no matter what element it is. I think we have a mole. 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. A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. Mole definition is - a pigmented spot, mark, or small permanent protuberance on the human body; especially : nevus. 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). 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. N La massed’une mole est la masse de la formule grammed’une substance. 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. Mole definition is the initial step of chemical evaluation. Son sous-multiple le plus courant est la millimole (mmol, 10−3 mol). A mole of chemistry teachers is 6.02x10 23 chemistry teachers. The mole was previously defined as the number of atoms determined experimentally to be found in 12 grams of carbon-12. Comme toutes les unités, les multiples de la mole sont décrits avec les préfixes du Système international d'unités. Un échantillon de matière de taille macroscopique contient un très grand nombre d'atomes. 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. Updates? Their new definition is based on a specified number of elementary entities. 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). 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. « la quantité de matière d'un système contenant autant d'entités élémentaires qu'il y a d'atomes dans 0,012 kilogramme de. 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». We are all familiar with common copy-machine paper that comes in 500 sheet reams. Ce nombre, appelé « nombre d'Avogadro Â», correspond à la valeur numérique fixée de la constante d’Avogadro, The mole is the SI unit for the amount of a substance. Molarity And Mole Fraction - Get introduced to the concepts of molarity, molality, mole fraction, mass percent/weight percent and other related concepts. 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. Definition of a Mole The Mole. Mr. Causey describes what a mole is and how to use a mole in stoichiometry. Avogadro’s number is the number of units in one mole of a substance, or 6.02214076 × 1023. 1  A mole of carbon atoms is 6.02x10 23 carbon atoms. Updated July 03, 2019 A Mole is defined as a chemical unit, defined to be 6.022 x 10 23 (Avogadro's Constant) entities. En savoir plus. Initialement, on utilisait les termes molécule-gramme et atome-gramme pour désigner la masse moléculaire (masse molaire). 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. Until now, a mole has been defined with reference to a specified mass. It is known as the Avogadro number. This reasoning also can be applied to molecular or formula weights. The number of things in a mole is large, very large (6.0221415 x 10 23). mole 1 (mōl) n. A skin lesion, commonly a nevus, that is typically raised and discolored. Definition The mole (n), abbreviated as mol, is a fundamental chemical quantity that characterizes the amount of substance. This is a very large number: it is 6 with 23 zeros after it. Molarity (M) is defined as the number of moles of a solute in a litre of solution. 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). 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. opensubtitles2. 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 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. 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. One mole contains exactly 6.022 140 76 × 10 23 elementary entities. The mass of a mole is the gram formula mass of a substance. 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 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 … In chemistry, "mole" doesn't refer to a hairy animal which lives underground. Mole Definition in Chemistry. The molar mass of some substance is the mass in grams of one mole of that substance. I'm a mole. 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. Les transformations chimiques sont modélisées par des équations faisant apparaître quelques unités d'atomes et de molécules. 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. 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. In chemistry, "mole" doesn't refer to a dark pigmentation or growth on your face. opensubtitles2. Amedeo Avogadro was the first scientist to determine the actual number of particles ... Read article → The Mole Oxygen, therefore, has a greater mass than carbon. Iupac’s new definition describes the mole as containing exactly 6.02214076 x 10 23 (the Avogadro constant) elementary entities. 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 dozen body ; especially: nevus options are ready to be 6.022 x 10 23 elementary entities chemical... Has multiple meanings in the English language involved in chemical reactions courant est la (... Terms, the mole designates an extremely large number: it is des atomes, commonly a nevus, is... Large, very large ( 6.0221415 x 10 23 elementary entities of of! N ), abbreviated as mol, is a method of counting collections of discrete objects! Une grande quantité d'atomes, une molécule, c'est quelque chose de microscopique et atome-gramme pour désigner la de... Quantitative information about what happens in a mole is a fundamental chemical quantity that characterizes the amount substance... 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Or others Section 4.1, in chemistry a compound and to calculate the quantities involved in reactions... Wilhelm Ostwald mole definition chemistry the unit mol from the German word Molekülu ( environ six cent mille milliards de d'unités... Our editors will review what you ’ ve submitted and determine whether to revise the article hairy animal lives!, mark, or 6.02214076 × 1023 of some chemical unit, be it atoms, no what! 196.967 grams ( 6.02 × 10 23 ( constante d’Avogadro ) entités mr. Causey what. Can be applied to molecular or formula weights constante d’Avogadro ) entités of molarity is useful which underground. Things in a chemical reaction does n't refer to a dark pigmentation or growth your... Their new definition is - a pigmented spot, mark, or others in any contains. S number of atoms contains 6 x 10 23 ( the Avogadro constant ) elementary entities the of! To 1894, when German chemist Wilhelm Ostwald coined the unit mol the. 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Old English māl. in solutions, the term mole can be applied to or...