[stupid_one]

hi,  i have a question for the exam. however, i have no idea where should i start can someone please *delete me*! please!

the question is the following:

the mechanism for the photolysis of acetaldehyde is given below. derive the rate equation for the formation of CO based on this mechanism.

CH3CHO + hv  CH3^. + CHO^.
CH3^. + CH3CHO  CH4 + CH3CO^.
CH3CO^.  CO +CH3^.
CH3^. + CH3^.  C2H6


i really need some help
thank you very much