The molar conductivities at infinite dilution for NaI, CH3COONa and ( CH3COO) 2 Mg are 12.69, 9.10 and 18.78 S m² mol−1. What is Λ °m for MgI ? 

  Molar conductivity for MgI2 can be calculated as follow:

                 Λ (CH3COO)2Mg =  18.78     

                  Λ NaI  =  12.69 

                   ΛCH3COONa  = 9.10

                   ΛMgI2 =  x

Λ∞ MgI2 =  Λ(CH3COO)2Mg + ΛNaI  -  ΛCH3COONa

  x = 18.78  + 12.69  - 9.10   

  22.37  =  x

  There for Λ °m for MgI2 is 22.37 S m² mol−1.

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