Hi, I am working my way through the answers to the question sheet but am confused: 1. The problem statement, all variables and given/known data 2. Relevant equations none 3. The attempt at a solution Why isnt NO2 a reaction intermediate? i.e. I thought that if when the equations were added, the ones that cancel are the reaction intermediates?? Also why isn't CNO in the rate law? I thought that the reaction intermediates were included in the rate law? Thanks for any help with this, it's not for any assigned work, I have to help with the tutorial itself so need to be able to explain this stuff to students.