Chapter 3 - Chemical Reactions and Reaction Stoichiometry - Exercises - Page 112: 3.3b

No

You can derive the empirical formula by looking at the product of the decomposition, but the actual molecular formula could be different. The original compound could be $NO_2$, but other configurations such as $N_3O_6$ are also possible and this cannot be determined by looking at the product of the decomposition.