![]() "Structural Properties of Chromium(III) Iodide and Some Chromium(III) Mixed Halides". Handbook of Inorganic Compounds, Second Edition. Ĭhromium triiodide was one of the first materials which was discovered to be a magnetic two-dimensional material that has great potentials for spintronics devices. ![]() Ĭhromium triiodide can also be prepared as nanoplatelets from the alkoxide Cr(OC(CH 3)(C(CH 3) 3) 2) 3. ![]() Addition of small amounts of chromous iodide accelerates the dissolving process. Like CrCl 3, the triiodide exhibits slow solubility in water owing to the kinetic inertness of Cr(III). Ĭhromium triiodide is stable in contact with oxygen and moisture, but at temperatures approaching 200 ☌ it reacts with oxygen and releases iodine. To obtain high purity samples, the product is thermally decomposed at 700 ☌ to sublime out chromium(II) iodide. Preparation and properties Ĭhromium triiodide is prepared by the direct reaction of chromium metal with an excess of iodine. In this structure, chromium exhibits octahedral coordination geometry. Like the isomorphous chromium(III) chloride ( CrCl 3), chromium(III) iodide exhibits a cubic-closest packing arrangement in a double-layer crystal lattice. It is a black solid that is used to prepare other chromium iodides. 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.Chromium(III) iodide, also known as chromium triiodide, is an inorganic compound with the formula Cr I 3. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. This site explains how to find molar mass.įinding molar mass starts with units of grams per mole (g/mol). The reason is that the molar mass of the substance affects the conversion. ![]() To complete this calculation, you have to know what substance you are trying to convert. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.Ī common request on this site is to convert grams to moles. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. These relative weights computed from the chemical equation are sometimes called equation weights. 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.įormula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction.
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