Im confused, what is it that we would actually have to do in a question since the ib state that we dont have to propose a reaction mechanism in the current syllabus, could you please help? :)

Ty :)

for the question before the last one, why can step 1's reverse rate have NO3 it in but step 2's rate cannot?

Nice explanation

Does k1 and k-1 cancel out because they are the same in equilibrium?

can I just look at the slow step and its coefficients to find the rate?

Why is the rate expression [NO2]2 if you ignore the intermediates? wouldn't it be first order?

So does that mean we can tell the order with respect to something based on if the slow step is uni or bimolecular?