Question

Product fraction Submitted (attach to report) Structures of Chromatography Fractions: (Hexane-eluted Product) (Acetone-eluted Product) color clear Color Yellow Mass Isolated (g) 0.177g Mass Isolated 0.35g m. p. (degree C)114.7c/116.5C (lit. value_) m. p. (degree C) 81.4C-/89.9c (lit. value_ Calculations: Mass of mixture applied to column (g) 0. 48 % Composition of Starting Mixture (show calculation) % (Mass) Recovery (show calculation) _% of Starting Mixture Recovered Questions: What is the maximum possible % recovery, and why would you not expect to get it? Give three possible reasons why the m. p. values of the isolated compounds might be lower than literature values.

Answer 1

Maximum possible recovery is

   One mole of reactant   =======> One mole of product    ( maximum possible product)

In the case of gram of reactant or product                        

gram / moleular mass = moles  

This is non polar (this will be eluted with hexane) Fluorenone fluorene Molecular Weight: 180.20 This polar compond eluted with polar acetone Molecular Weight: 166.22