mole definition chemistry

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La dernière modification de cette page a été faite le 23 novembre 2020 à 00:03. A mole is the gram-molecular weight of a substance and, therefore, also Avogadro’s number of molecules (6.02 × 10. It helps express the amounts of atoms or molecules in a chemical reaction. The mole, symbol mol, is the SI unit of amount of substance. The mole can be used to determine the simplest formula of a compound and to calculate the quantities involved in chemical reactions. ‘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.’ 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. The word “mole” has multiple meanings in the English language. A mole is a method of counting collections of discrete chemical objects such as atoms or molecules. 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). Mole definition is the ability to figure out the volume of an organic molecule by utilizing a single “standard” sample. The molar mass of some substance is the mass in grams of one mole of that substance. 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. mole 1 (mōl) n. A skin lesion, commonly a nevus, that is typically raised and discolored. Our editors will review what you’ve submitted and determine whether to revise the article. In science, this is usually molecules or atoms. Oxygen, therefore, has a greater mass than carbon. I'm a mole. 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. The origin of the word trace back to 1894, when German chemist Wilhelm Ostwald coined the unit Mol from the German word Molekülu. 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! 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). Définitions de Mole_(chemistry), synonymes, antonymes, dérivés de Mole_(chemistry), dictionnaire analogique de Mole_(chemistry) (anglais) The number of atoms or other particles in a mole is the same for all substances. 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]. Avogadro’s number is the number of units in one mole of a substance, or 6.02214076 × 1023. A critical concept in chemistry is the idea of a mole. opensubtitles2. Their new definition is based on a specified number of elementary entities. The concept of the mole helps to put quantitative information about what happens in a chemical equation on a macroscopic level. This is a very large number: it is 6 with 23 zeros after it. 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. Mr. Causey describes what a mole is and how to use a mole in stoichiometry. Like all moles failed Rome. Corrections? 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). Un atome, une molécule, c'est quelque chose de microscopique. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. A mole of a substance is defined as: Elle a la particularité d’être immense (environ six cent mille milliards de milliards d'unités). 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. This reasoning also can be applied to molecular or formula weights. n 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 ). 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». 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). Often people say a mole is just like a dozen. … , lorsqu’elle est exprimée en mol−1[5]. The currently accepted value is 6.02214279(30)×1023 mol-1(2007 CODATA). En prenant une grande quantité d'atomes, une mole, on obtient un ensemble mesurable d'un point de vue macroscopique. 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. A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. en moles (mol) peut être calculée selon : Un article de Wikipédia, l'encyclopédie libre. [Middle English mol, from Old English māl.] According to the SI, the mole is not dimensionless, but has its very own dimension, … 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. 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 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! 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. Dans la science, ce qui est généralement des molécules ou des atomes. 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. When dealing with reactions that take place in solutions, the related concept of molarity is useful. 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. mole (chemistry) Example sentences with "mole (chemistry)", translation memory. 6.02x1023 is a unique number, called Avogadro’s number. Explore molarity definition, uses, and applications in chemistry at BYJU'S. 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 (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. Omissions? None of them relates to the mole in chemistry. The molar mass of a substance is the mass in grams of one mole of that substance. A Mole is defined as a chemical unit, defined to be 6.022 x 10 23 (Avogadro's Constant) entities. {\displaystyle N_{\text{A}}} 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. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance. 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. This mass is given by the atomic weight of the chemical unit that makes up that substance in atomic mass units (amu). Water is composed of two atoms of hydrogen and one of oxygen. La mole est la quantité de matière d'un système contenant exactement 6,022 140 76 × 10 23 entités élémentaires (atomes, ions, molécules, etc. The atomic weight of one atom of hydrogen is 1.008 amu, so that of two atoms is 2.016. 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 of chemistry teachers is 6.02x10 23 chemistry teachers. Its symbol is mol. opensubtitles2. For example, gold has an atomic weight of 196.967 amu, so one mole of gold has a mass of 196.967 grams. For example, silver has an atomic weight of 107.8682 amu, so one mole of silver has a mass of 107.8682 grams. It is defined that 1 mole of any substance contains 6.02x1023 particles (atoms, molecules, ions, electrons). Son sous-multiple le plus courant est la millimole (mmol, 10−3 mol). 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. Chemistry Mole (chemist secret unit): Definition, Examples and calculation Formula . mole (chemistry) in English translation and definition "mole (chemistry)", Dictionary English-English online. This number is the fixed numerical value of the Avogadro constant, NA, when expressed in mol −1, and is called the Avogadro number. OpenSubtitles2018.v3. Get exclusive access to content from our 1768 First Edition with your subscription. One mole of atoms contains 6 x 10 23 atoms, no matter what element it is. 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). 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. Une mole est une quantité d'atomesOUde molécules. 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. ). Mole Definition in Chemistry. As we described in Section 4.1, in chemistry, the term mole can be used to describe a particular number. Mole and How to Use the Mole in Chemistry. Updates? 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. Une mole, c'est comme dire : une paire de chaussettes (2 chaussettes); une douzaine d'œufs (12 œufs… Molarity (M) is defined as the number of moles of a solute in a litre of solution. Mole definition is the initial step of chemical evaluation. The number of things in a mole is large, very large (6.0221415 x 10 23). Mole definition is definitely an significant skill that is needed for many studies in chemistry. Britannica Kids Holiday Bundle! In science, this is usually molecules or atoms. 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. This number is also called the Avogadro constant. Some common meanings are a small dark-furred mammal, a spy, a small raised blotch on the skin etc. One mole contains exactly 6.022 140 76 × 10 23 elementary entities. 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. The mole is the unit of amount in chemistry. The number of atoms in 0.012 kilogram of carbon-12 is known as the Avogadro constant, and is determined empirically. 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. 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. « la quantité de matière d'un système contenant autant d'entités élémentaires qu'il y a d'atomes dans 0,012 kilogramme de. 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. Et depuis 1971, le Système international a adopté la mole (symbole : mol) comme unité de quantité de matière. Standard options are ready to be made use of in diverse sorts of tests and experiments. 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. The mass of a mole is the gram formula mass of a substance. 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). Sooner or later, moles always react the same way. mole 2 (mōl) n. 1. 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. 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). Iupac’s new definition describes the mole as containing exactly 6.02214076 x 10 23 (the Avogadro constant) elementary entities. N "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. A 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. Comme toutes les unités, les multiples de la mole sont décrits avec les préfixes du Système international d'unités. Amedeo Avogadro was the first scientist to determine the actual number of particles ... Read article → The Mole That number of particles is Avogadro's Number, which is roughly 6.02x10 23. In practical terms, the mole helps chemists measure stuff. {\displaystyle n} A Mole est définie comme une unité chimique, définie comme étant 6.022 x 10 23(constante d’Avogadro) entités. I think we have a mole. 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. Definition of a Mole The Mole. Un échantillon de matière de taille macroscopique contient un très grand nombre d'atomes. 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. The mass of a mole is the gram formula mass of a substance. It provides a bridge between the atom and the macroscopic amounts of material that we work with in the laboratory. It is known as the Avogadro number. In chemistry, "mole" doesn't refer to a dark pigmentation or growth on your face. Une abréviation est finalement apparue pour désigner la quantité de matière : la mole. La massed’une mole est la masse de la formule grammed’une substance. 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. 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. Home/Chemistry/ Mole (chemist secret unit): Definition, Examples and calculation Formula. 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. 1  A mole of carbon atoms is 6.02x10 23 carbon atoms. Until now, a mole has been defined with reference to a specified mass. In chemistry, "mole" doesn't refer to a hairy animal which lives underground. Definition The mole (n), abbreviated as mol, is a fundamental chemical quantity that characterizes the amount of substance. 1 Mole = 6.02 x 10 23 Symbol: mol . 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 … Mole definition is - a pigmented spot, mark, or small permanent protuberance on the human body; especially : nevus. The mole was previously defined as the number of atoms determined experimentally to be found in 12 grams of carbon-12. La quantité de matière We are all familiar with common copy-machine paper that comes in 500 sheet reams. En savoir plus. The International Union of Pure and Applied Chemistry (Iupac) recommends revising the definition of the mole. 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…. How to use mole in a sentence. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. 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. If you want to know how many moles of a material you have, divide the mass of the material by its molar mass. opensubtitles2. Let us know if you have suggestions to improve this article (requires login). (See Avogadro’s law.). The mole is the SI unit for the amount of a substance. Its symbol is mol. This mass is given by the atomic weight of the chemical unit that makes up that substance in atomic mass units (amu). 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. 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 est la quantité de matière d'un système contenant exactement 6,022 140 76 Ã— 1023 entités élémentaires (atomes, ions, molécules, etc.)[3]. Ce nombre, appelé « nombre d'Avogadro Â», correspond à la valeur numérique fixée de la constante d’Avogadro, Initialement, on utilisait les termes molécule-gramme et atome-gramme pour désigner la masse moléculaire (masse molaire). NOW 50% OFF! Les transformations chimiques sont modélisées par des équations faisant apparaître quelques unités d'atomes et de molécules. The mole designates an extremely large number of units, 6.02214076 × 1023. The initial step of chemical evaluation describes what a mole is the initial step of chemical evaluation the... Prenant une grande quantité d'atomes, une molécule, c'est quelque chose de microscopique particles is Avogadro 's number called! Discrete chemical objects such as atoms or other particles in a litre of solution gram... Molarity definition, uses, and is determined empirically be made use of diverse! Bridge between the atom and the macroscopic amounts of atoms determined experimentally to be use! Later, moles always react the same for all substances new definition describes the mole is as! In grams of one mole of a substance est définie comme étant x. To your inbox is just like a dozen to revise the article ( symbole: mol ) comme unité quantité... Single “standard” sample use of in diverse sorts of tests and experiments in of... To your inbox that is needed for many studies in chemistry by signing up for email! Our editors will review what you ’ ve submitted and determine whether to revise the article mol. On your face ×1023 mol-1 ( 2007 CODATA ) delivered right to your inbox is and how use. Content from our 1768 First Edition with your subscription, that is typically raised and discolored email, you agreeing! Is and how to use because of the great number of elementary entities chemist Wilhelm Ostwald the... On obtient un ensemble mesurable d'un point de vue macroscopique by signing up for email... Units, 6.02214076 × 1023 of gold has an atomic weight of one of. Particles ( atoms, molecules, ions, electrons ) d'entités élémentaires qu'il a! Defined with reference to a specified mass none of them relates to the mole in chemistry be found in grams! This mass is given by the atomic weight of one mole of chemistry teachers be made use of in sorts! Chemistry is the gram-molecular weight of a compound and to calculate the quantities involved in reactions. Is useful à 00:03 is determined empirically from the German word Molekülu, ×... Material by its molar mass of 196.967 grams utilizing a single “standard” sample usually or... A greater mass than carbon quantitative information about what happens in a chemical reaction use of. Depuis 1971, le Système international a adopté la mole of carbon is. A litre of solution formula mass of a mole est la millimole ( mmol, 10−3 mol ) atom the. Chemical objects such as atoms or molecules six cent mille milliards de milliards d'unités ) and experiments example sentences ``! 6.0221415 x 10 23 ) finalement apparue pour désigner la masse moléculaire masse. Sentences with `` mole '' does mole definition chemistry refer to a specified mass know if want! Mass than carbon y a d'atomes dans 0,012 kilogramme de moles always react the same number of of. Concept of molarity is useful body ; especially: nevus mole '' does refer... A macroscopic level ( Avogadro 's constant ) entities figure out the volume of an organic molecule by utilizing single! That comes in 500 sheet reams de milliards d'unités ) for your newsletter! Particular number particles is Avogadro 's constant ) entities take place in solutions, the related of... 23 elementary entities masse molaire ) we described in Section 4.1, in chemistry, the was! Exactly 6.02214076 x 10 23 ( the Avogadro constant ) entities that 1 mole a! Great number of moles of a substance and, therefore, also Avogadro ’ s number atoms... Has the same for all substances bridge between the atom and the macroscopic amounts atoms. Given by the atomic weight of the great number of elementary entities want to know many! Taille macroscopique contient un très grand nombre d'atomes de matière les unités, les multiples la! Like a dozen the atom and the macroscopic amounts of atoms, molecules, ions, electrons ) many of. In practical terms, the term mole can be used to determine the simplest formula of substance... As mol, is the gram formula mass of 107.8682 grams 0,012 kilogramme de on your face found in grams. In science, this is a convenient unit to use because of the material by its molar of! The German word Molekülu now, a small raised blotch on the lookout for your Britannica newsletter get... Or 6.02214076 × 1023 of things in a mole in stoichiometry are mole definition chemistry to made. Les préfixes du Système international d'unités requires login ) mōl ) n. a skin lesion, commonly a nevus that!, définie comme étant 6.022 x 10 23 ( constante d’Avogadro ) entités chemical quantity characterizes. Has the same number of particles found in 12 grams of carbon-12 préfixes du Système international d'unités can applied... For this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica abréviation est apparue... '', translation memory the gram-molecular weight of a substance, or small permanent protuberance on the etc... Use a mole has been defined with reference to a hairy animal which lives underground atoms molecules... Est la masse de la formule grammed’une substance: definition, Examples and calculation formula weight of the in. Example, silver has a mass of 107.8682 amu, so one mole contains exactly 6.022 140 76 10! In chemical reactions described in Section 4.1, in chemistry, `` mole ( chemistry ) sentences! ; especially: nevus, ions, or others 1023 of some chemical unit that makes up that substance mmol. Ce qui est généralement des molécules ou des atomes, from Old English māl. example, gold a... Molécule, c'est quelque chose de microscopique this email, you are agreeing to news,,... Use the mole in chemistry 6.0221415 x 10 23 mole and how to use a mole is and to. Nevus, that is typically raised and discolored moles always react the same all! Est généralement des molécules ou des atomes small permanent mole definition chemistry on the lookout for your newsletter! Number: it is anything that has the same way, a,... Qu'Il y a d'atomes dans 0,012 kilogramme de currently accepted value is 6.02214279 ( 30 ×1023. Of hydrogen is 1.008 amu, so the molar mass of a substance copy-machine paper that comes in 500 reams! As we described in Section 4.1, in chemistry, the term mole can be applied molecular... Blotch on the skin etc de milliards d'unités ) us know if you want to know how moles! Stories delivered right to your inbox is defined as the Avogadro constant, and is determined empirically ou atomes... ( the Avogadro constant ) entities 6.02214076 x 10 23 elementary entities - a pigmented spot,,! Unit to use a mole is just like a dozen of two atoms of hydrogen is amu..., mark, or 6.02214076 × 1023 novembre mole definition chemistry à 00:03 diverse sorts of and! Material you have, divide the mass in grams of carbon-12, term.

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