A soil sample was found to have a CEC of 24.0 cmol _c kg ^-1 . Important: note that a cmol is not  the same thing as a cmol _c for divalent and trivalent ions!

A.  How many cmol _c kg ^-1 of Al ³⁺ would be required to satisfy this negative charge?         

B.  How many cmol kg ^-1 of Al ³⁺ would be required to satisfy this negative charge?           

C.  How many cmol _c kg ^-1 of Mg ²⁺ would be required to satisfy this negative charge?        

D.  How many cmol kg ^-1 of Na ⁺ would be required to satisfy this negative charge?            

E.  How many mg kg ^-1 of Mg ²⁺ would be required to satisfy this negative charge?  (Show all work/units for full credit!)