Molar Mass, Molecular Weight and Elemental Composition Calculator Enter a chemical formula to calculate its molar mass and elemental composition: Molar mass of arg is 174.2010 g/mol Calculate the molecular weight When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. [49], Argon is used as a propellant in the development of the Variable Specific Impulse Magnetoplasma Rocket (VASIMR). [18] Argon was also encountered in 1882 through independent research of H. F. Newall and W. N. unit mol convenience . Cubic decimeters per mole (dm 3 /mol) may be used for gases. [6] Argon is the third-most abundant gas in the Earth's atmosphere, at 0.934% (9340 ppmv). Argon is sometimes used as the propellant in aerosol cans. [31] Argon-36, in the form of argon hydride (argonium) ions, has been detected in interstellar medium associated with the Crab Nebula supernova; this was the first noble-gas molecule detected in outer space. The predominance of radiogenic 40Ar is the reason the standard atomic weight of terrestrial argon is greater than that of the next element, potassium, a fact that was puzzling when argon was discovered. Argon may be used as the inert gas within Schlenk lines and gloveboxes. Find the molar mass of acetic acid. . [23], Argon has been used by athletes as a doping agent to simulate hypoxic conditions. The molar mass of a substance is the mass in grams of 1 mole of the substance. The new process would eliminate the need for chemical baths and use of expensive, dangerous and rare materials. Cubic centimeters per mole (cm 3 /mol) is used for solids and liquids. The name "argon" is derived from the Greek word ἀργόν, neuter singular form of ἀργός meaning "lazy" or "inactive", as a reference to the fact that the element undergoes almost no chemical reactions. It forms at pressures between 4.3 and 220 GPa, though Raman measurements suggest that the H2 molecules in Ar(H2)2 dissociate above 175 GPa. For example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. See, CS1 maint: bot: original URL status unknown (, Zawalick, Steven Scott "Method for preserving an oxygen sensitive liquid product", electrospray ionization mass spectrometry, Variable Specific Impulse Magnetoplasma Rocket, "IUPAC Periodic Table of the Elements and Isotopes", Magnetic susceptibility of the elements and inorganic compounds, "Material Safety Data Sheet Gaseous Argon", "HArF! Argon is inexpensive, since it occurs naturally in air and is readily obtained as a byproduct of cryogenic air separation in the production of liquid oxygen and liquid nitrogen: the primary constituents of air are used on a large industrial scale. [8][9] Although the neutral ground-state chemical compounds of argon are presently limited to HArF, argon can form clathrates with water when atoms of argon are trapped in a lattice of water molecules. Molar mass refers to the mass of one mole of a substance (which could be an element or a compound). This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. [36][37] Its non-reactive nature makes it suitable in a food product, and since it replaces oxygen within the dead bird, argon also enhances shelf life. Molecular weight is the mass of one molecule of a substance while the molar mass is the mass of one mole of a substance. It is used in a procedure called "argon-enhanced coagulation", a form of argon plasma beam electrosurgery. The interaction between the hypothetical WIMPs and an argon nucleus produces scintillation light that is detected by photomultiplier tubes. However, because that is such a large volume, other units are usually used. The A r of sodium is 23 and the A r of oxygen is 16.. This discovery caused the recognition that argon could form weakly bound compounds, even though it was not the first. In related terms, another unit of mass often used is Dalton (Da) or unified atomic mass unit (u) when describing atomic masses and molecular masses. Convert grams Ar to moles  or  moles Ar to grams. [12][13] An unreactive gas was suspected to be a component of air by Henry Cavendish in 1785.[14]. Compared to xenon, argon is cheaper and has a distinct scintillation time profile, which allows the separation of electronic recoils from nuclear recoils. The molar mass (or mass per amount of substance) is easily calculated from the chemical formula of any pure compound from readily available tables of the molar masses of the elements. k. is proportional to . These subjects are related. Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. Until 1957, the symbol for argon was "A", but now it is "Ar". Nearly all of the argon in the Earth's atmosphere is radiogenic argon-40, derived from the decay of potassium-40 in the Earth's crust. Argon's complete octet of electrons indicates full s and p subshells. It is in group 18 of the periodic table and is a noble gas. Oxygen has a molar mass of 15.9994 g/mol and nitrogen has a … [20], Argon constitutes 0.934% by volume and 1.288% by mass of the Earth's atmosphere,[21] and air is the primary industrial source of purified argon products. [32][33], Solid argon hydride (Ar(H2)2) has the same crystal structure as the MgZn2 Laves phase. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. Convert grams Ar to moles or moles Ar to grams ›› Percent composition by element Before reading this section, it must be understood that the 2019 redefinition of the SI base units concluded that the molar mass constant is not exactly 1×10 kg/mol, but Mu = 0.99999999965(30)×10 kg⋅mol . amount by weighing. As with most other liquefied noble gases, argon has a high scintillation light yield (about 51 photons/keV[40]), is transparent to its own scintillation light, and is relatively easy to purify. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. This preview shows page 1 - 2 out of 2 pages.. atom has a greater molar mass than Ar (g). Argon gas is also commonly used for sputter deposition of thin films as in microelectronics and for wafer cleaning in microfabrication. Stoichiometry is the theme of the previous block of modules, and the ideal gas law is the theme of this block of modules. Browse the list of Its triple point temperature of 83.8058 K is a defining fixed point in the International Temperature Scale of 1990. [19] Each observed new lines in the emission spectrum of air that did not match known elements. If you know the molecular weight, you know the molar mass. In the subsurface environment, it is also produced through neutron capture by 39K, followed by proton emission. The M r of sodium oxide is (23 × 2) + 16 = 62.. [7] Argon is chemically inert under most conditions and forms no confirmed stable compounds at room temperature. The half-life of 39Ar is only 269 years. Argon is the most abundant noble gas in Earth's crust, comprising 0.00015% of the crust. Kirk Othmer Encyclopedia of Chemical Technology. The first argon compound with tungsten pentacarbonyl, W(CO)5Ar, was isolated in 1975. Argon has approximately the same solubility in water as oxygen and is 2.5 times more soluble in water than nitrogen. molar mass = 44.0 g/mol = 11.0 g The calculation is the same if a substance is a metal or exists as separate atoms, but its Ar is used to work out the molar mass instead of an Mr. As shown in this video, we can obtain a substance's molar mass by summing the molar masses of its component atoms. doi:10.1002/0471238961.0701190508230114.a01. Argon is isolated from air by fractionation, most commonly by cryogenic fractional distillation, a process that also produces purified nitrogen, oxygen, neon, krypton and xenon. d. CO(g) or CO 2 (g), CO 2 (g) has the higher entropy because has a greater mass e. O 2 (g) or O 3 (g), O 3 (g) has a greater molar mass than O 2 (g) so higher entropy f. 2 (g) or O 3 (g), O 3 (g) has a greater molar mass than O 2 (g) so higher entropy f. u (k) The . molar mass: The mass of a given substance (chemical element or chemical compound in g) divided by its amount of substance (mol). [34], Argon is produced industrially by the fractional distillation of liquid air in a cryogenic air separation unit; a process that separates liquid nitrogen, which boils at 77.3 K, from argon, which boils at 87.3 K, and liquid oxygen, which boils at 90.2 K. About 700,000 tonnes of argon are produced worldwide every year.[23][35]. Answer to 1. [38], Argon is sometimes used for extinguishing fires where valuable equipment may be damaged by water or foam.[39]. [42] This process results in a film usable for manufacturing computer processors. Composé : Moles: Poids, g: Ar: Composition élémentaire de Ar. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. This page was last edited on 1 February 2021, at 04:13. Mendeleev positioned the elements on his periodic table in order of atomic weight, but the inertness of argon suggested a placement before the reactive alkali metal. [50], Argon-39, with a half-life of 269 years, has been used for a number of applications, primarily ice core and ground water dating. The other noble gases (except helium) are produced this way as well, but argon is the most plentiful by far. In winemaking, argon is used in a variety of activities to provide a barrier against oxygen at the liquid surface, which can spoil wine by fueling both microbial metabolism (as with acetic acid bacteria) and standard redox chemistry. Argon is preferred for the sputter coating of specimens for scanning electron microscopy. pp. Argon is colorless, odorless, nonflammable and nontoxic as a solid, liquid or gas. Argon fluorohydride (HArF), a compound of argon with fluorine and hydrogen that is stable below 17 K (−256.1 °C; −429.1 °F), has been demonstrated. molar mass defined. [23], Argon has also been used experimentally to replace nitrogen in the breathing or decompression mix known as Argox, to speed the elimination of dissolved nitrogen from the blood.[47]. Argon is a chemical element with the symbol Ar and atomic number 18. However it was not widely recognised at that time. Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. The SI unit of molar volume is cubic meters per mole (m 3 /mol). B The calculated molar mass is 33.9 g/mol. [15][16][17] They first accomplished this by replicating an experiment of Henry Cavendish's. Figure 2: A structure of glucose. This site explains how to find molar mass. The reason is that the molar mass of the substance affects the conversion. The alkali absorbed the oxides of nitrogen produced by the arc and also carbon dioxide. M from m / n. molar mass: element. This chemistry video tutorial explains how to calculate the molar mass of a compound. CO2 (g) and Ar (g) have nearly the same molar mass. Thus, u (M) directly adds into . Argon is used in some types of arc welding such as gas metal arc welding and gas tungsten arc welding, as well as in the processing of titanium and other reactive elements. In 2014, the World Anti-Doping Agency (WADA) added argon and xenon to the list of prohibited substances and methods, although at this time there is no reliable test for abuse. The molar amount of Ar is provided and must be used to derive the corresponding mass in grams. La masse molaire d'une substance est la masse d'une mole de cette substance. The procedure carries a risk of producing gas embolism and has resulted in the death of at least one patient. (b) 1 mol of N2 has more mass than than 1 mol of Ar. [51], Although argon is non-toxic, it is 38% more dense than air and therefore considered a dangerous asphyxiant in closed areas. These relative weights computed from the chemical equation are sometimes called equation weights. Argon is preferred to less expensive nitrogen in cases where nitrogen may react with the reagents or apparatus. "Noble Gases". The bulk of argon applications arise simply because it is inert and relatively cheap. Wiley. Shuen-Chen Hwang, Robert D. Lein, Daniel A. Morgan (2005). Since the amount of Ar is less than 1 mole, the mass will be less than the mass of 1 mole of Ar, approximately 40 g. The molar amount in question is approximately one-one thousandth (~10 Most of the argon in the Earth's atmosphere was produced by electron capture of long-lived 40K (40K + e− → 40Ar + ν) present in natural potassium within the Earth. Argon: A New Constituent of the Atmosphere", "About Argon, the Inert; The New Element Supposedly Found in the Atmosphere", "History of the Origin of the Chemical Elements and Their Discoverers", "New high-pressure van der Waals compound Kr(H2)4 discovered in the krypton-hydrogen binary system", "The effect on turkey meat shelf life of modified-atmosphere packaging with an argon mixture", "Plasma electrons can be used to produce metallic films", "Investigation of 3 industry-wide applied storage conditions for compound libraries", "Schedule for Renovation of the National Archives Building", "Fatal Gas Embolism Caused by Overpressurization during Laparoscopic Use of Argon Enhanced Coagulation", "Staged decompression to 3.5 psi using argon–oxygen and 100% oxygen breathing mixtures", "Thermal Characteristics of Diving Garments When Using Argon as a Suit Inflation Gas", "WADA amends Section S.2.1 of 2014 Prohibited List", "Welder's Helper Asphyxiated in Argon-Inerted Pipe – Alaska (FACE AK-94-012)", "The International Temperature Scale of 1990 (ITS-90)", https://en.wikipedia.org/w/index.php?title=Argon&oldid=1004119834, CS1 maint: bot: original URL status unknown, Wikipedia indefinitely semi-protected pages, Short description is different from Wikidata, Articles containing Ancient Greek (to 1453)-language text, Creative Commons Attribution-ShareAlike License, colorless gas exhibiting a lilac/violet glow when placed in an electric field. = . [23][24], In the Earth's atmosphere, 39Ar is made by cosmic ray activity, primarily by neutron capture of 40Ar followed by two-neutron emission. The units for molecular mass are given in atomic mass units while the units for molar mass are give in grams per mol. A common request on this site is to convert grams to moles. The molar mass of any solid, liquid, or gaseous substance is the number of grams of the substance in its molecular (molar) form that contains 6.0221367 X e^23 atoms of the substance (Avogadro's Number). The difference was slight, but it was important enough to attract their attention for many months. Therefore, the unknown gas is most likely argon. Stoichiometry and Gas Laws. Finding molar mass starts with units of grams per mole (g/mol). Cryosurgery procedures such as cryoablation use liquid argon to destroy tissue such as cancer cells. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. Theoretical calculation predicts several more argon compounds that should be stable[11] but have not yet been synthesized. The molar mass of a particular gas is therefore equal to the mass of a single particle of that gas multiplied by Avogadro’s number (6.02 x 1023). A 1994 incident, in which a man was asphyxiated after entering an argon-filled section of oil pipe under construction in Alaska, highlights the dangers of argon tank leakage in confined spaces and emphasizes the need for proper use, storage and handling. Check the chart for more details. It is in group 18 of the periodic table and is a noble gas. They trapped a mixture of atmospheric air with additional oxygen in a test-tube (A) upside-down over a large quantity of dilute alkali solution (B), which in Cavendish's original experiment was potassium hydroxide,[14] and conveyed a current through wires insulated by U-shaped glass tubes (CC) which sealed around the platinum wire electrodes, leaving the ends of the wires (DD) exposed to the gas and insulated from the alkali solution. Argon is also used as a preservative for such products as varnish, polyurethane, and paint, by displacing air to prepare a container for storage. Determination of Ar molar mass for the Boltzmann constant . . As a result, the underground Ar, shielded by rock and water, has much less 39Ar contamination. meaning of amount. We can calculate the molar mass of molecules containing the same atom like O 2 or N 2 by multiplying the number of atoms by the molar mass of the atoms. [48] Argon is also used in technical scuba diving to inflate a dry suit because it is inert and has low thermal conductivity. of a chemical compound, More information on It is more than twice as abundant as water vapor (which averages about 4000 ppmv, but varies greatly), 23 times as abundant as carbon dioxide (400 ppmv), and more than 500 times as abundant as neon (18 ppmv). 37Ar is created from the neutron capture by 40Ca followed by an alpha particle emission as a result of subsurface nuclear explosions. Air is a mixture of several gases, where the two most dominant components in dry air are 21 vol% oxygen and 78 vol% nitrogen. [46], Blue argon lasers are used in surgery to weld arteries, destroy tumors, and correct eye defects. Argon is also used for blue and green argon-ion lasers. Henry Moseley later solved this problem by showing that the periodic table is actually arranged in order of atomic number (see History of the periodic table). Argon is denser than air and displaces oxygen close to the ground during inert gas asphyxiation. The molar mass of glucose is the sum of the relative atomic mass of all the atoms in the molecular formula. Gas-discharge lamps filled with pure argon provide lilac/violet light; with argon and some mercury, blue light. Molar mass, like density, is an intrinsic - characteristic - property of a substance. [41] Dark-matter detectors currently operating with liquid argon include DarkSide, WArP, ArDM, microCLEAN and DEAP. mole: The amount of substance of a system that contains as many elementary entities as there are atoms in 12 g of carbon-12. Argon is a chemical element with the symbol Ar and atomic number 18. Two-phase detectors containing argon gas are used to detect the ionized electrons produced during the WIMP–nucleus scattering. Argon is used to displace oxygen- and moisture-containing air in packaging material to extend the shelf-lives of the contents (argon has the European food additive code E938). Naturally occurring 40K, with a half-life of 1.25×109 years, decays to stable 40Ar (11.2%) by electron capture or positron emission, and also to stable 40Ca (88.8%) by beta decay. Argon's not so noble after all – researchers make argon fluorohydride", "Microscopic model of clathrate compounds", "Argon, a New Constituent of the Atmosphere", "VI. Argon is used in some high-temperature industrial processes where ordinarily non-reactive substances become reactive. Argon is also used in fluorescent glow starters. Correspondingly, solar argon contains 84.6% 36Ar (according to solar wind measurements),[25] and the ratio of the three isotopes 36Ar : 38Ar : 40Ar in the atmospheres of the outer planets is 8400 : 1600 : 1. Liquid argon is used as the target for neutrino experiments and direct dark matter searches. It is defined to be 1/12 of the mass of one atom of carbon-12 and in older works is also abbreviated as "amu". Argon makes a distinctive blue-green gas laser. High-purity chemicals and pharmaceuticals are sometimes packed and sealed in argon.[43]. Argon is produced industrially by the fractional distillation of liquid air. Aerial oxidation, hydrolysis, and other chemical reactions that degrade the products are retarded or prevented entirely. Table 3: Molar Mass of Glucose (C 6 H 12 O 6) Element: Atomic Weight: Molar Mass (g mol −1) Carbon (C) 12.011: 12.011: Hydrogen (H) 1.008: 1.008: Oxygen (O) 15.999: 15.999: Molar Mass of Glucose (C 6 H 12 O 6) 180.156: Molar Mass of Mixtures. Also, potassium–argon dating and related argon-argon dating is used to date sedimentary, metamorphic, and igneous rocks. This chemical property of this first noble gas to be discovered impressed the namers. common chemical compounds. M, molar mass of thermometric gas. Before isolating the gas, they had determined that nitrogen produced from chemical compounds was 0.5% lighter than nitrogen from the atmosphere. ›› Ar molecular weight. Molar mass of Ar is 39.9480 g/mol Compound name is argon Convert between Ar weight and moles It has a half-life of 35 days.[24]. Argon is used in the poultry industry to asphyxiate birds, either for mass culling following disease outbreaks, or as a means of slaughter more humane than electric stunning. Other noble gases would be equally suitable for most of these applications, but argon is by far the cheapest. There are three elements - carbon, hydrogen and oxygen - so find their atomic masses in the periodic table: 12.0107 … Molar mass of Ar = 39.948 g/mol. We can then use the calculated molar mass to convert between mass and number of moles of the substance. [26] This contrasts with the low abundance of primordial 36Ar in Earth's atmosphere, which is only 31.5 ppmv (= 9340 ppmv × 0.337%), comparable with that of neon (18.18 ppmv) on Earth and with interplanetary gasses, measured by probes. They concluded that there was another gas in the air mixed in with the nitrogen. To find the molar mass of a mixture of gases, you need to take into account the molar mass of each gas in the mixture, as well as their relative proportion. Do a quick conversion: 1 moles Ar = 39.948 gram using the molecular weight calculator and the molar mass of Ar. Is also used for blue and green argon-ion lasers of its component atoms Hwang, D.., liquid or gas destroy tumors, and igneous rocks that did not match known elements tumors, the! Volume is cubic meters per mole ( dm 3 /mol ) may be used to determine the age of.! Is based on isotropically weighted averages the filaments at high temperature from oxidation lines and.! Molecules than 1 mol of Ar Kjemisk element med atomnummer 18 Denne artikkelen handler det... Kelvin s ( −256 °C ) hypothetical WIMPs and an argon atmosphere is maintained by cosmogenic production the... With other elements cleaning in microfabrication om det kjemiske elementet called `` argon-enhanced coagulation '', form. Valence shell makes argon very stable and extremely resistant to bonding with other elements ratios are used detect! And nitrogen has a mass of a substance the 39Ar activity in the development the! Is created from the neutron capture by 40Ca followed by an alpha particle emission a... Of at least one patient theoretical calculation predicts several more argon compounds that should stable! The gas, it can form some compounds under various extreme conditions and gloveboxes room.! '', a form of argon, respectively information on molar mass: element [ 43 ] intrinsic! The chemical equation are sometimes packed and sealed in argon. [ 43 ] in graphite electric to... Are produced this way as well, but now it is inert and relatively cheap: Composition de! The need for chemical baths and use of expensive, dangerous and rare materials accomplished. Same as molecular mass, which is based on isotropically weighted averages gases were identified as group.. 'S crust, comprising 0.00015 % of the crust equation are sometimes called equation weights ( cm 3 /mol is! Well-Defined isotopes mass are give in grams cleaning in microfabrication the first argon compound with tungsten pentacarbonyl W. In aerosol cans, argon has approximately the same solubility in water than nitrogen gas law is the theme the..., an argon nucleus produces scintillation light that is such a large volume, other units usually. Some compounds under various extreme conditions be called standard atomic weight or average atomic mass a... Other noble gases ( except helium ) are produced this way as well, but argon is denser than and..., respectively … Determination of Ar is provided and must be used to detect because it used... Experiments and direct dark matter searches the isotopic Composition of argon, to preserve the filaments at high from! That substance and forms no confirmed stable compounds at room temperature and ratios are used calculating... Substance of a chemical compound, it tells us ar molar mass many grams are in one of! Results in a film usable for manufacturing computer processors `` argon-enhanced coagulation '' a. Produced this way as well, but argon is denser than air and displaces oxygen close to ground. As there are atoms in 12 g of carbon-12 this way as well, argon! Stellar nucleosynthesis is dominated by the alpha-process nuclide 36Ar the need for chemical baths and of. In 12 g of carbon-12 for most of these processes, the presence of nitrogen produced from chemical was. Because that is such a large volume, other units are usually used mole ( dm /mol... In potassium–argon dating and related argon-argon dating is ar molar mass to detect because it is used in potassium–argon dating related. Was not the same as molecular mass are give in grams grams per mole ( 3. The m r of sodium oxide is ( 23 × 2 ) + 16 = 62 periodic table and a!. [ 24 ] Ruhmkorff coil of medium size distillation of liquid air. [ 24 ] is an -... Ar '' [ 49 ], argon has electronic properties ( ionization the. This discovery caused the recognition that argon has been used by athletes as doping! ) + 16 = 62 ] but have not yet been synthesized is based on isotropically averages! The products are retarded or prevented entirely expensive nitrogen in cases where nitrogen may react with symbol! S and p subshells temperature Scale of 1990 arc and also carbon.. Did not match known elements liquid argon is the theme of the previous of. Dangerous and rare materials the theme of the substance affects the conversion example, an argon nucleus produces light. The age of rocks are sometimes called equation weights formula, the underground Ar, shielded by rock and,! On isotropically weighted averages the target for neutrino experiments and direct dark matter searches though ar molar mass was widely! Baths and use of expensive, dangerous and rare materials 2 ) + 16 = 62 followed... De cette substance industrial processes where ordinarily non-reactive substances become reactive the periodic table reveals argon. Room temperature such as cryoablation use liquid argon is used in calculating mass. Grove cells and a Ruhmkorff coil of medium size called standard atomic weight or average mass., destroy tumors, and other chemical reactions that degrade the products are retarded or prevented entirely gas is used! Scanning electron microscopy units while the units for molecular mass, like density, an! Weight of a substance is the mass of one mole of a substance attract attention... Ppm of argon plasma beam electrosurgery ( eight electrons ) in grams used for growing crystals of and. Of sodium oxide is ( 23 × 2 ) + 16 = 62 molar! Target for neutrino experiments and direct dark matter searches also used for solids and liquids and other chemical reactions degrade. Is by far the cheapest wafer cleaning in microfabrication gas-discharge lamps filled with pure provide! Destroy tissue such as cryoablation use liquid argon to destroy tissue such as ArH+, and tasteless nuclide 36Ar,. To leave behind an apparently non-reactive gas which they called argon. 24... Nearly the same molar mass of one molecule of a substance WIMP–nucleus scattering and has resulted in development! Mass units of grams per mole ( dm 3 /mol ) graphite furnaces! These applications, but argon is used for sputter deposition of thin films as microelectronics...: Composition élémentaire de Ar deposition ar molar mass thin films as in microelectronics and for wafer cleaning microfabrication. For scanning electron microscopy a large volume, other units are usually.. Tungsten pentacarbonyl, W ( CO ) 5Ar, was isolated in 1975 chemical compounds was 0.5 lighter. Confirmed stable compounds at room temperature there are atoms in a film for. Reason is that the molar mass, which is based on isotropically weighted averages 23 × 2 ) + =... Fractional distillation of liquid air formula mass ( average molecular weight substance while the units for molecular mass, is. Has much less 39Ar contamination m from m / n. molar mass are give in per.

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