mole scientific definition
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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 atoms in 0.012 kg of carbon-12. Symbol: mol.
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International System of Units 1 The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is mol.he SI unit of amount of substance is the mole (mol): 1  The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is mol.
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Lab 1: Determination of Avogadroâs Number Lab 1: Determination of Avogadro’s Number. Avogadro’s number is considered one of the few fundamental constants in chemistry. By definition, it is the number of Carbon atoms in exactly 12 grams of carbon. A mole of any substance contains an extremely large number of particles and will always be equal to the molar mass of the substance or element. There are over twenty different methods used to determine the value of Avogadro’s number.
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NPL's guide to the mole (mol) In common with several other SI units, the definition of the mole is presently being reconsidered. Since it is related to the kilogram, there is a pressure to reconsider its definition and relate it more directly to a specified number of entities. This would lead to a fixed value for 'the Avogadro constant'.
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The mole is used extensively in chemistry, why not elsewhere? The mole is useful in chemistry because it relates two popular but inconsistent units of mass - the atomic mass unit (u) and the gram. One mole of atoms of an element with atomic mass x u, has a mass of x grams. We don't use atomic mass units outside chemistry, so we also have no need for the mole.
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- The molar volume, symbol V m, is the volume occupied by one mole of a substance (chemical element or chemical compound) at a given temperature and pressure. It is equal to the molar mass (M) divided by the mass density (ρ).
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- exists and is an alternate of. Merge this question into. Split and merge into it. Answered by The Community. Making the world better, one answer at a time. A mole is basically an amount of something. In chemistry, a mole is known as a chemical mole. To figure out the weight of a mole, you figure out the molar mass.
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What is Avogadro's number? Avogadro’s number, number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.022140857 × 1023. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction (if any). See also Avogadro’s law.
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What exactly is a mole? The mass per mole of a substance is called its molar mass. Since the atomic mass unit (amu) is defined as 1/12 of the mass of the 12C atom, it follows that the molar mass of a substance, measured in grams per mole, is numerically equal to its mean atomic or molecular mass measured in amu.
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- Do not confuse moles with molarity: molarity is a measure of concentration, while moles are a measure of the amount of substance. Key Terms. molarity: The concentration of a substance in solution, expressed as the number moles of solute per liter of solution.
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Avogadro's Number Definition Avogadro's Number Definition. Avogadro's number is the number of particles found in one mole of a substance. It is the number of atoms in exactly 12 grams of carbon-12. This experimentally determined value is approximately 6.0221 x 1023 particles per mole.
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Mole (unit) 1 the mole is not a true metric (i.e. measuring) unit, rather it is a parametric unit and amount of substance is a parametric base quantity; 2  the SI defines numbers of entities as quantities of dimension one, and thus ignores the ontological distinction between entities and units of continuous quantities.
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mole pigmented mole see under nevus. mole 1 (mōl) n. A skin lesion, commonly a nevus, that is typically raised and discolored. mole 2 (mōl) n. A fleshy abnormal mass formed in the uterus by the degeneration or abortive development of an ovum. mole 1. Etymology: L, mass, Usage notes: informal. 1 a pigmented nevus. 2 (in obstetrics) a hydatid mole. mole 2
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Understanding the Mole Unit of Measurement A mole is the quantity of anything that has the same number of particles found in 12.000 grams of carbon-12. That number of particles is Avogadro's Number, which is roughly 6.02x10 23. A mole of carbon atoms is 6.02x10 23 carbon atoms. A mole of chemistry teachers is 6.02x10 23 chemistry teachers. It's a lot easier to write the word 'mole' than to write '6.02x10 23 ' anytime you want to refer to a large number of things! Basically, that's why this particular unit was invented.
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- What is the difference between mass and mole? A Mole is a number, mass is a measure of how much stuff there is (often mistaken as weight). Mole: 6.022 141 79 × 1023 Molar mass is how much mass a mole (a num … ber) of a particular atom or molecule has. 6.022 141 79 × 1023 Atoms of Hydrogen have a mass of about 1.0079 g. The molar mass of Hydrogen is 1.0079 g/mol. Mass can be measured in many things- grams, pounds, tonnes, stones, Earths- it can not be measured in moles.
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- 9.01 g. A mole is defined as the amount of a substance whose mass in grams equals the atomic, molecular, or formula-unit mass in atomic mass units. Example 1: Water (H_2O) has two hydrogen atoms and one oxygen atom per molecule.
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Amount of substance The International System of Units (SI) defines the amount of substance to be proportional to the number of elementary entities present. The SI unit for amount of substance is the mole. It has the unit symbol mol. The mole is defined as the amount of substance that contains an equal number of elementary entities as there are atoms in 12 g of the isotope carbon-12. This number is called Avogadro's number and has the value 7023602214085700000♠6.022140857(74)×1023.
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- Confidence votes 123. The English word mole comes from the German word Mol, short for Molekulargewicht meaning molecular weight. This is thought to have come from the French word moleculaire moléculaire meaning. Molecule The latin root is molecula a diminitive for the word moles meaning. masshe Latin root is molecula a diminitive for the word moles meaning mass. The word mole is used when we're talking about numbers of atoms and molecules.
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- Avogadro’s number, the number of particles in a mole, is. most reliably determined by X-ray diffraction of crystals. In 1986, based on studies of silicon crystals, the number. was deﬁned as 6.0221367 x 1023.
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Ch 3 Mass Relationships in Chemical Reactions mole (mol). -A unit to count numbers of particles-is the amount of a substance that contains as many elementary entities (atoms, molecules, or other particles) as there are atoms in exactly 12.00 grams of 12C (carbon-12 isotope).   .
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- The number of molecules per mole is known as Avogadro's constant, and is defined such that the mass of one mole of a substance, expressed in grams, is equal to the mean relative molecular mass of the substance.
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- Or to put it another way the principle that equal volumes of all gases at the same temperature and pressure contain the same number of molecules. Avogadro's number is one of the fundamental constants of chemistry. It permits calculation of the amount of pure substance (mole), the basis of stoichiometric relationships.
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Mole (unit) The mole may also be used to express the number of atoms, ions, or other elementary entities in a given sample of any substance. The concentration of a solution is commonly expressed by its molarity, defined as the number of moles of the dissolved substance per litre of solution.
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- From Yahoo Answers. Question: The mole concept is important in chemistry because 1. atoms and molecules are very small and themole concept allows us to count atoms and molecules by weighing macroscopic amounts of material. 2. it establishes a standard for reaction stoi-chiometry. 3. it explains the properties of gases.