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Atomistry » Ruthenium » Physical Properties » Atomic Weight | |||||||||||
Atomistry » Ruthenium » Physical Properties » Atomic Weight » |
Atomic Weight of RutheniumApproximate Atomic Weight of Ruthenium
That the atomic weight of ruthenium is approximately 100 and not a multiple or sub-multiple of this amount is evident from various considerations, namely:
Exact Atomic Weight of Ruthenium
For many years the accepted value for the atomic weight of ruthenium was 103, a figure derived from the work of Claus. This chemist decomposed potassium chlor-ruthenite, K2RuCl5, by heating it in a stream of hydrogen, noted the loss in weight, and separated and determined the amounts of ruthenium and potassium chloride in the residue. From his values for the percentages of ruthenium, potassium chloride, and chlorine expelled, the corresponding atomic weights deduced for ruthenium are 103.2, 107.4, and 97.1 respectively. These results are obviously of no present value.
In 1889, Joly determined the percentage of ruthenium in three pure ruthenium compounds, viz. (i) ruthenium dioxide, RuO2, (ii) ruthenium nitrosochloride, Ru(NO)Cl3.H2O, and (iii) ammonium nitrosochlor-ruthenate, (NH4)2Ru(NO)Cl5. In each case reduction to the metal was brought about by heating the compound in a stream of hydrogen. The mean results were as follow:
In 1912, Vogt analysed ruthenium dioxide by reducing it to the metal in a stream of hydrogen, obtaining as a mean of six experiments, the following result: Ru:RuO2::76.053:100.000 whence Ru = 101.63 The International Committee for 1918 on Atomic Weights accepts the value Ru = 101.7. Further determinations of this constant are clearly desirable. |
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