Dear Lenida Kyndiah thank you for posting this important question on RG. It is certainly of broad interest to many other RG members as well. My suggestion is to use RG directly as a valuable source of information. For example, you can check the "Questions" section of RG to find closely related question. In this context it might be helpful reading the answers given to the following questions which have been asked earlier on RG:

How do I calculate TON and TOF?

https://www.researchgate.net/post/How-do-I-calculate-TON-and-TOF

(15 answers)

and

Hello, How to calculate the TOF(Turnover frequency ) and the amount of the catalyst active sites? Thank you!

https://www.researchgate.net/post/Hello_How_to_calculate_the_TOFTurnover_frequency_and_the_amount_of_the_catalyst_active_sites_Thank_you

(34 answers)

These are just two typical examples. Good luck with your work!

Dear Lenida Kyndiah

In spite of your interesting question, I would like to recommend you two important refererences:

Article “Turning Over” Definitions in Catalytic Cycles

Article Comment on “‘Turning Over’ Definitions in Catalytic Cycles”

I think it would be useful to better calculate concentration with respect to the time rather than TON since it is not clear its definition yet. Even in UPAC I regret to say that definition is not finding.

With kind regards,

Julián Sánchez.

I suggest you refer this discussion:

https://www.researchgate.net/post/How_to_calculate_the_turnover_number_of_a_catalyst