Inorganic Homework Help

I am taking Inorganic Chemistry and the math is so difficult!!!!!!!!!!   Each week once we go to a new chapter my teacher gives a handout with math problems.  But I seriously cannot figure out how to even start doing several of these equations….. 3. Write the rate equation for the following: A. N2   + O2   —-> 2 NO First, how do you even get 2NO???  How do you even write an equation from that? 4. Write an equilibrium equation for the following: A. H2   + F2    <----> 2HF Again I have no idea how you get 2HF…….. or how to write an equation from that.