Nitrogen dioxide decompositions

Dinitrogen pentoxide gas decomposes to form nitrogen dioxide and oxygen. The reaction is first-order and has a rate constant of 0.247 h1 at 25°C. If a 2.50-L flask originally contains N205 at a pressure of 756 mm Hg at 25°C, then how many moles of 02 are formed after 135 minutes (Hint. First write a balanced equation for the decomposition.)... 

Consider what happens when a sample of N204, a colorless gas, is placed in a closed, evacuated container at 100°C. Instantly, a reddish-brown color develops. This color is due to nitrogen dioxide, NO2, harmed by decomposition of part of the N2O4 (Figure 12.1, p. 324) ... 

FIGURE 15.6 Dinitrogen trioxide, N2Oj, condenses to a deep-blue liquid that freezes at 100°C to a pale-blue solid, as shown here. On standing, it turns green as a result of partial decomposition into nitrogen dioxide, a yellow-brown gas. 

The decomposition of dinitrogen tetroxide produces nitrogen dioxide N2 04(g) -> 2 N02(g)... 

This example shows that first-order kinetics are not restricted to reactions with just one starting material, such as the decomposition of nitrogen dioxide or the isomerization of s-2-butene. 

Decomposition Oxidizes in air to form nitrogen dioxide, which is extremely reactive and a strong oxidizer. Upon contact with moisture and oxygen, it produces nitrous and nitric acids. 

Many second-order reactions follow Class I rate expressions. Among these are the gas-phase thermal decomposition of hydrogen iodide (2HI - H2 + I2), dimerization of cyclopen-tadiene (2C5H6 -> C10H12), and the gas phase thermal decomposition of nitrogen dioxide (2N02 2NO + 02). 

The thermal decomposition of nitrogen pent-oxide to oxygen and nitrogen dioxide... 

The decomposition of nitrogen dioxide, 2N02 = 2N0 + 02, has a second order rate equation. Data at different temperatures are tabulated. Find the Arrhenius parameters. 

Let s apply the preceding two paragraphs to an example problem. The first-order decomposition of gaseous dinitrogen pentoxide, N205, to nitrogen dioxide, NO2, and oxygen, 02, has a rate constant of 4.9 X 10 4 s 2 at a certain temperature. Calculate the half-life of this reaction. 

The reaction in water at pH 7.4 has been much studied since the discovery of the importance of nitric oxide. The products are as for the thermal and photochemical reactions, except that the final product is nitrite ion. This is to be expected since nitric oxide in aerated water at pH 7.4 also yields quantitatively nitrite ion25, by it is believed the series of equations 7-9, which involves oxidation to nitrogen dioxide, further reaction to give dinitrogen trioxide which, in mildly alkaline solution, is hydrolysed to nitrite ion. Under anaerobic conditions it is possible to detect nitric oxide directly from the decomposition of nitrosothiols using a NO-probe electrode system26. Solutions of nitrosothiols both in... 

A variety of nitrogen oxides (NO ) such as nitric oxide (NO) and nitrogen dioxide (NO2) as well as nitrous oxide (N2O) are present in the atmosphere. The sources of these oxides are biological actions and organic decomposition in the soil and in the ocean... 

Consider the following example. Using information from the SQA Data Booklet and the fact that silver(l) nitrate and nitrogen dioxide have S° values of 142 and 241J K mol respectively, calculate the standard entropy change, AS°, for the decomposition of silver(l) nitrate ... 

There are many examples of second-order reactions for example, associations, addition reactions, etc. The decomposition of gaseous nitrogen dioxide (2NO2 2NO + O2) follows the rate law, -d[N02]/dr = fc[N02]. The binding of a hormone to a receptor protein is also second-order. 

However, above 50°C decomposition in moist air forms nitric oxide, nitrogen dioxide, and sulfuric acid ... 

The compound decomposes readily to nitrogen dioxide and chlorine on heating slow decomposition can occur at ordinary temperatures ... 

Peroxynitrous acid is a powerful oxidizing agent with estimated one- and two-electron reduction potentials of ° (ONOOH, H+/"N02, HjO) = 1.6-1.7 V and ° (ONOOH, H /N02 , H2O) = 1.3-1.4 V, respectively . In addition, it was reported that, upon protonation, ONOO can undergo decomposition via homolytic 0—0 cleavage to generate nitrogen dioxide radical ("NO2) and hydroxyl radical ( OH) in approximately 30% yields... 

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