Molybdenum calculation

The molybdenum in these salts may be oxidised by ammoniaeal silver nitrate and the equivalent of the molybdenum calculated from the amount of silver liberated the results obtained indicate a trivalent molybdenum atom. 

The composition (in percent by weight) of a typical stainless steel is 69% iron, 17% chromium, 12% nickel, and 2% molybdenum. Calculate the absorption cross section of this stainless steel for 2200-ms" neutrons. 

Nelson et al. [34] determined from void shapes that the ratio 7100/7110 was 1.2, 0.98 and 1.14 for copper at 600°C, aluminum at 550°C, and molybdenum at 2000°C, respectively, and 1.03 for 7100/7111 for aluminum at 450°C. Metal tips in field emission studies (see Section VIII-2C) tend to take on an equilibrium faceting into shapes agreeing fairly well with calculations [133]. 

Such significant increase of accuracy may be explained on the base of analysis of the numerical values of the theoretical correction coefficients and calculated for 1, , and for analytical pai ameter lQ.j,yipj.j,jj- Changing from lines intensities for the ratios of analytical element line intensity to the intensity of the line most effecting the result of analytical element (chromium in this case) measurement enables the decreases of the error 5 or even 10 times practically to the level of statistics of the count rate. In case of chromium the influencing elements will be titanium, tungsten or molybdenum. 

Figure 4.16. Free-surface velocity profiles measured on 1400° C molybdenum. The free-surface velocity profile is characterized by an 0.05 km/s amplitude elastic precursor, a plastic wave front, and a spall signal (characteristic dip) upon unloading. The dashed lines represent the expected free surface velocity based on impedance-match calculation [Duffy and Ahrens, unpublished].

Of the many molybdenum sulfides which have been reported, only MoS, M0S2 and M02S3 are well established. A hydrated form of the trisulfide of somewhat variable composition is precipitated from aqueous molybdate solutions by H2S in classical analytical separations of molybdenum, but it is best prepared by thermal decomposition of the thiomolybdate, (NH4)2MoS4. MoS is formed by heating the calculated amounts of Mo and S in an evacuated tube. The black M0S2, however, is the most stable sulfide and, besides being the principal ore of Mo,... 

The Unit of Structure.—A spectral photograph of the K-radiation of molybdenum reflected from the face (100) of hematite (planes denoted by primes refer to the axes used by Groth) gave, as shown in Table I, the value 3.682 0.010 A. for d/n. If n is one, this corresponds to a unit of structure with a = 3.70 A., and a = 85° 42. With one Fe2C>3 in this unit, the density calculated from the X-ray data is 5.25, in good agreement with the observed values,1 which range from 5.15 to 5.30. 

In order to explain why the bridging vinylidene group of MoCo2(/r 3-)F-CCH2) (COlsI / -CyHOr" (Fig. 83) leans toward the molybdenum atom rather than a cobalt atom, EHMO calculations have been employed. Results showed that the... 

No new peaks were observed in the mechanical mixtures. The binding energies of all elements were the same in the pure phases and in the mixtures [14]. Figure 1 shows the apparent atomic percentages of molybdenum and cobalt, as given by XPS, on the surface of the sulfided pure phases and mechanical mixtures. In both cases, the experimental results are close to the theoretical values calculated according to Equation 2. 

Figure 1. Molybdenum (left) and cobalt (right) apparent contents (atomic %), determined by XPS, in SA6 ( ), SA12 ( ) and SA60 ( ) series, compared to the theoretical values calculated by Equation 2 (dashed lines).

After having described molybdenum trioxide, we intend to specify the best finite clusters allowing to represent each of the (010), (001) and (100) faces in order to study surface properties such as energy and electronic distribution. For this purpose, the evolution of the electronic properties will be studied as a function of the cluster size and referred to the results of an EHT - band calculation [12] all calculations have been made with QCPE programs [13,14] and Hoffmann parameters [15],... 

Extended Hiickel molecular-orbital (EHMO) calculations using structural parameters from the X-ray determination of Cp(CO)3Mo 3In (Fig. 29) and ideal symmetry Cih were carried out for this compound in order to investigate the extent of the indium-molybdenum ir-bonding.122 The HOMO of the compound is the 3e molecular orbital, which is In—Mo [Pg.54]

Fig. 4. Anaerobic titration of xanthine oxidase with xanthine at pH 8.2 with a reaction time of 2 min. at about 20°. The integrated intensity of the Rapid molybdenum EPR signals (in arbitrary units) is plotted against the number of moles of xanthine added per mole of active enzyme. Activity/A4jo for the enzyme samples used was 112 corresponding to an active enzyme content of 57%. Thus the molar ratios of xanthine/total xanthine oxidase have been multiplied by 1.76 to refer to the active form only. Some of the EPR spectra (recorded at about — 130° and 9.3 GHz) are reproduced to show the changes in signal type as the amount of xanthine is increased. (Data re-calculated from ref. 88, with intensities corrected for variations in tube diameter and enzyme concentration calculated in terms of active enzyme.)...

Fig. 9. Distribution of mononuclear molybdenum(VI) species as a function of the pH calculated from constants given in Table V.

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