Dinitrogen pentoxide measurement

Evidence from the viscosities, densities, refractive indices and measurements of the vapour pressure of these mixtures also supports the above conclusions. Acetyl nitrate has been prepared from a mixture of acetic anhydride and dinitrogen pentoxide, and characterised, showing that the equilibria discussed do lead to the formation of that compound. The initial reaction between nitric acid and acetic anhydride is rapid at room temperature nitric acid (0-05 mol 1 ) is reported to be converted into acetyl nitrate with a half-life of about i minute. This observation is consistent with the results of some preparative experiments, in which it was found that nitric acid could be precipitated quantitatively with urea from solutions of it in acetic anhydride at —10 °C, whereas similar solutions prepared at room temperature and cooled rapidly to — 10 °C yielded only a part of their nitric acid ( 5.3.2). The following equilibrium has been investigated in detail ... 

For example, suppose we were to measure different amounts of solid dinitrogen pentoxide, N20< , into five flasks of the same volume, immerse all the flasks in a water bath at 65°C to vaporize all the solid, and then use spectrometry to monitor the concentration of reactant remaining in each flask as the N205 decomposes ... 

Evidence from the viscosities, densities, refractive indices6 and measurements of the vapour pressure7 of these mixtures also supports the above conclusions. Acetyl nitrate has been prepared from a mixture of acetic anhydride and dinitrogen pentoxide, and characterised, showing that the equilibria discussed do lead to the formation of that compound.8... 

If the progress of a reaction causes a change in the total number of moles of gas present, the change in pressure of the reaction mixture (held at constant temperature and constant volume) lets us measure how far the reaction has gone. For instance, the decomposition of dinitrogen pentoxide, N205(g), has been studied by this method. 

Dinitrogen pentoxide decomposes into nitrogen dioxide and ojqrgen. If 5.00 L of N2O5 reacts at STP, what volume of NO2 is produced when measured at 64.5°C and 1.76 atm ... 

For experimental convenience, early studies of reaction rates were largely devoted to processes whose reaction times could be measured in minutes or hours. An example is the decomposition of dinitrogen pentoxide dissolved in carbon tetrachloride ... 

The surface area of the catalyst before use was determined to be 163 m g by dinitrogen adsorption. After use the surface area was re-measured and a value of 70 m g was obtained. The catalyst, before and after use, was also examined by X-ray diffraction. Before use y-alumina and vanadium pentoxide were detected, however after use the. major alumina phases detected were a and 5, vanadium pentoxide was also observed... 

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