Nitrogen monoxide physical properties

The reaction-gas stream is assumed to possess the same thermal and physical properties as air. This is an acceptable approximation because the only significant change made from standard air composition is that a fraction of the oxygen is lost in favour of nitrogen monoxide. These two minor components also have very similar molecular weights. 

The concept of bioisosterism derives from Langmuir s (l)observationthat certain physical properties of chemically different substances (e.g., carbon monoxide and nitrogen, ketene and diazomethane) are strikingly similar. These similarities were rationalized on the basis that carbon monoxide and nitrogen both have 14 orbital electrons and, similarly. 

The physical properties of carbon monoxide and nitrogen are strikingly similar ... 

Alumina is stable in air, vacuum, water vapor, hydrogen, carbon monoxide, nitrogen, and argon at temperatures up to 1700°C. Hydrogen fluoride will react with alumina. At high temperatures ( 1700 C) alumina will vaporize as AI2O in the presence of either water vapor or reducing atmospheres. A compilation of the electrical and physical properties of alumina is hsted in Table 2.4. 

It is known from a variety of physical and chemical evidence that CO is a poor a donor and a good 7t acceptor, but the opposite is true of CN, while CNH can be expected to have intermediate properties. In a formal sense, carbon monoxide may be derived from the ligand CNH by coalescence of the nitrogen and hydrogen nuclei. The general observation, made in molecular spectroscopy, is that the electronic structure of a diatomic hydride resembles the combined atom more closely than the separated atoms. Thus, it is reasonable that the electronic structure of CNH will resemble CO more closely than CN-. This is also borne out by a semi-empirical self-consistent molecular orbital calculation, the results of which are summarized in Fig. 7. 

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