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According to your experience as a chemist how many experiments made by a chemist per year are useless ?

Our definition of a useless reaction is the following :

  • not working, and could be anticipated : a lot of people have tried it (or very similar) all over the world and it's not working for sure, but the knowledge is not accessible
  • a calculation error has been made, preventing to obtain the desired product

Please put only a number of reactions, no scales, no percentage. Thank you. 

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