The vessel the reaction takes place in can also affect the reaction. The walls of the vessel can enhance or retard a particular reaction.
Gas pressure can also affect reactions.
The products that are formed in a chemical reaction can depend upon the medium, e.g., in a water solvent versus a benzene solvent. Depending upon how these various factors, and others, play their role, the reaction, as written, may or may not go to completion. In most cases the reaction does not go to completion. The solution is filtered and the white precipitate collected and dried. The dried precipitate is measured to have a mass of 53.6 g.