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Nickel sulfide is any inorganic compound with the formula Ni x S y.These compounds range in color from bronze (Ni 3 S 2) to black (NiS 2).The nickel sulfide with simplest stoichiometry is NiS, also known as the mineral millerite.
Nickel sulfate hexahydrate under a microscope. At least seven sulfate salts of nickel(II) are known. These salts differ in terms of their hydration or crystal habit.. The common tetragonal hexahydrate crystallizes from aqueous solution between 30.7 and 53.8 °C.
The z-average molar mass is the third moment or third power average molar mass, which is calculated by ¯ = The z-average molar mass can be determined with ultracentrifugation. The melt elasticity of a polymer is dependent on M z. [5]
where M w is the mass-average molar mass (or molecular weight) and M n is the number-average molar mass (or molecular weight). Pure Appl. Chem. , 2009 , 81(2), 351-353
The dalton, symbol Da, is also sometimes used as a unit of molar mass, especially in biochemistry, with the definition 1 Da = 1 g/mol, despite the fact that it is strictly a unit of mass (1 Da = 1 u = 1.660 539 068 92 (52) × 10 −27 kg, as of 2022 CODATA recommended values). [6] Obsolete terms for molar mass include gram atomic mass for the ...
Note that the especially high molar values, as for paraffin, gasoline, water and ammonia, result from calculating specific heats in terms of moles of molecules. If specific heat is expressed per mole of atoms for these substances, none of the constant-volume values exceed, to any large extent, the theoretical Dulong–Petit limit of 25 J⋅mol ...
Silicon nitride is a chemical compound of the elements silicon and nitrogen. Si 3 N 4 (Trisilicon tetranitride) is the most thermodynamically stable and commercially important of the silicon nitrides, [6] and the term ″Silicon nitride″ commonly refers to this specific composition.
The geometry of the nickel(II) ion is square planar. [2] It is surrounded by two equivalents of the conjugate base (dmgH −) of dimethylglyoxime (dmgH 2).The pair of organic ligands are joined through hydrogen bonds to give a macrocyclic ligand.