How do you do a structural diagram of reactant molecules

2 no + )2 -> 2no3

Structural digram of product molecules

Please use correct capitalization on chemical names. Otherwise, there can be ambiguity. For example, is co carbon monoxide (CO) or cobalt (Co)

2NO + O_2 \rightarrow 2NO_3

The structural diagram of NO would simply be N=O. The structural diagram of NO3 would be an N bonded to three oxygen atoms.