Nitrosyl bromide decomposition

Nitrosyl bromide (NOBr) decomposes to nitrogen oxide and bromine. Use the following data to determine the order of the decomposition reaction of nitrosyl bromide. 

Storage of nitrosyl fluoride in the glass reaction vessel containing KF is possible for a few days however, the use of an inert-metal vessel containing anhydrous KF is preferred for an extended period of time. Nitrosyl chloride is stable at room temperatxure but will always contain a small amount of NO and CU because of its reversible decomposition of 0.5%. The reversible decomposition of nitrosyl bromide is appreciable enough at room temperature (7 %) to require storage at a lower temperature, or the gas can be prepared immediately prior to use. ... 

Potassium bromide is prepared in the same manner as described for KCl. The addition of 0.002 mole of NOa to the reaction vessel allows essentially complete reaction to occxur within 30 minutes. The yield is generally greater than 90%. The product obtained is a red-colored gas similar in appearance to NOa. Nitrosyl bromide undergoes reversible decomposition at room temperature to the extent of about 7 %. The presence of the excess KBr does not appear to affect this equilibrium. 

The decomposition of nitrosyl bromide is followed by measuring total pressure because the number of moles of gas changes it cannot be followed colorimetrically because both NOBr and Br2 are reddish brown ... 

---