Product Name: Yttrium Nitride Product Number: All applicable American Elements product codes, e.g. 3.2.3. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. List of Uranium Compounds, Common Compounds of Uranium U, Formula, Molecular Weight This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. In addition to radioactive concerns common to all uranium chemistry, production of uranium nitrido complexes has been slowed by harsh reaction conditions and solubility challenges. Use of the isotope 15N (which constitutes around 0.37% of natural nitrogen) is preferable because the predominant isotope, 14N, has a not insignificant neutron absorption cross section which affects neutron economy and, in particular, it undergoes an (n,p) reaction which produces significant amounts of radioactive 14C which would need to be carefully contained and sequestered during reprocessing or permanent storage. Fox, A. R.; Arnold, P. L.; Cummins, C. C. Uranium−Nitrogen Multiple Bonding: Isostructural Anionic, Neutral, and Cationic Uranium Nitride Complexes Featuring a Linear U═N═U Core. Mater. Matthews, R. B.; Chidester, K. M.; Hoth, C. W.; Mason, R. E.; Petty, R. L. Rundle, R. E.; Baenziger, N. C.; Wilson, A. S.; McDonald, R. A. Weck P. F., Kim E., Balakrishnan N., Poineau F., Yeamans C. B., and Czerwinski K. R. Wang, X.; Andrews, L.; Vlaisavljevich, B.; Gagliardi, L. Évarestov, R. A., Panin, A. I., & Losev, M. V. Nocton, G.; Pécaut, J.; Mazzanti, M. A Nitrido-Centered Uranium Azido Cluster Obtained from a Uranium Following hybridation, UH3 can be exposed to a nitrogen atmosphere at temperatures around 500 °C, thereby forming U2N3. of a chemical compound, More information on Uranium dinitrides decompose to uranium mononitride by the following sequence of reactions: The molecular formula for Uranium (III) Nitride is UN. 238.02891 + 14.0067. King, D.; Tuna, F.; McInnes, E.; McMaster, J.; Lewis, W.; Blake, A.; Liddle, S. T. Synthesis and Structure of a Terminal Uranium Nitride Complex. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. SECTION 1. Calculate the molecular weight The word nitride refers to the −3 oxidation state of the nitrogen bound to the uranium. 1 mole is equal to 1 moles Uranium (III) Nitride, or 252.03561 grams. molar mass and molecular weight, Convert grams Uranium(III) Nitride to moles. Uranium nitride (UN) 25658-43-9. The number of electrons in each of Uranium's shells is 2, 8, 18, 32, 21, 9, 2 and its electronic configuration is [Rn] 5f 3 6d 1 7s 2. [11] It also has a superior mechanical, thermal and radiation stability compared to standard metallic uranium fuel. Decomposition of UN2 is the most common method for isolating uranium sesquinitride (U2N3). Each uranium dinitride complex is considered to have three distinct compounds present simultaneously because of decomposing of uranium dinitride (UN 2) into uranium sesquinitride (U 2 N 3), and the uranium mononitride (UN). IDENTIFICATION. These relative weights computed from the chemical equation are sometimes called equation weights. Browse the list of common chemical compounds. The necessity to use expensive, highly isotopically enriched 15N is a significant factor to overcome. Uranium mononitride is being considered as a potential fuel for generation IV reactors such as the Hyperion Power Module reactor created by Hyperion Power Generation. Fox, A.; Cummins, C. Uranium−Nitrogen Multiple Bonding: The Case of a Four-Coordinate Uranium(VI) Nitridoborate Complex. UN or NU. [20][21], Except where otherwise noted, data are given for materials in their. Azide. [14][16] [2], The common techniques for generating UN is carbothermic reduction of uranium oxide (UO2) in a 2 step method illustrated below. This site explains how to find molar mass. [13], UN has a face-centered cubic crystal structure of the NaCl type. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. To complete this calculation, you have to know what substance you are trying to convert. An additional method of UN synthesis employs fabrication directly from metallic uranium. UN is considered superior because of its higher fissionable density, thermal conductivity and melting temperature than the most common nuclear fuel, uranium oxide (UO2), while also demonstrating lower release of fission product gases and swelling, and decreased chemical reactivity with cladding materials. [13] The SI base unit for amount of substance is the mole. In its elemental form uranium's CAS number is 7440-61-1. By additional heating to temperatures above 1150 °C, the sesquinitride can then be decomposed to UN. The uranium atom has a radius of 138.5.pm and its Van der Waals radius is 186.pm. Molecular Formula. Uranium nitride has been considered as a potential fuel for nuclear reactors. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. [4], The uranium dinitride (UN2) compound has a face-centered cubic crystal structure of the calcium fluoride (CaF2) type with a space group of Fm3m. Convert grams Uranium(III) Nitride to moles  or  moles Uranium(III) Nitride to grams, Molecular weight calculation: [14][17] N forms a triple bond with uranium creating a linear structure. This is necessary due to the (relatively) high neutron capture cross-section of the far more common 14N, which reduces the neutron economy and thus efficiency of a reactor. Uranium nitride. [18][19] Other U≡N compounds have also been synthesized or observed with various structural features, such as bridging nitride ligands in di-/polynuclear species, and various oxidation states. [6] Hydrogen fluoride is a colourless gas at this temperature and mixes with the ammonia gas. In general, the experimental studies of uranium nitride are limited in size; especially the electronic structure is lacking, so it is necessary to predict the electronic structure of uranium nitride using theoretical calculations. By exposing metallic uranium to hydrogen gas at temperatures in excess of 280 °C, UH3 can be formed. Uranium nitride is any of a family of several ceramic materials: uranium mononitride (UN), uranium sesquinitride (U2N3) and uranium dinitride (UN2). Thomson, R. K.; Cantat, T.; Scott, B. L.; Morris, D. E.; Batista, E. R.; Kiplinger, J. L. Uranium azide photolysis results in C–H bond activation and provides evidence for a terminal uranium nitride. [3][4], Sol-gel methods and arc melting of pure uranium under nitrogen atmosphere can also be used.[5]. Find Similar Structures. [9][12] The thermal conductivity is on the order of 4-8 times higher than that of uranium dioxide, the most commonly used nuclear fuel, at typical operating temperatures. The covalent portion of the bonds forms from the overlap between the 6d orbital and 7s orbital on the uranium and the 2p orbitals on the nitrogen. 117595. Synonyms. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes.

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