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makenziemartinez
24.05.2021 •
Chemistry
Which combination of genes (genotype) are considered hybrid? (only one)
A.) TT
B.) Tt
C.) tt
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Ответ:
Strontium chloride octamine, Sr(NH3)(8)Cl-2, has been shown to be a highly efficient ammonia reservoir for selective catalytic reduction of NO gases in vehicle exhaust and to hold great potential for indirect hydrogen storage. The possible applications of such metal amines depend explicitly on the conditions for ammonia release and it is thus essential to understand the exact ab- and desorption mechanisms. Here, we apply equilibrium pressure measurements from ammonia desorption, X-ray powder diffraction and density functional theory calculations to identify thermodynamically stable Sr(NH3)Cl-2, Sr(NH3)(2)Cl-2 and Sr(NH3)(8)Cl-2 phases. The crystal structures were solved in the space groups Cmcm, Aem2 and Pnma respectively. Controversy regarding the possible existence of a diamine phase is resolved on the basis of a combined structural and thermodynamic analysis of the ammonia release mechanisms, yielding a diamine structure with nearly the same stability as the monoamine. Depending on temperature and pressure, the diamine phase is found to have marginally higher or lower stability than the monoamine phase which explains why the diamine phase is found in some experiments and is not found in others.
Explanation: