Question

what is the molar conductance at infinite dilution of Alluminium sulphate​

Answer 1

#BAL

From  Kohlrausch's law of independent migration ,

Which states that in the limit of infinite dilution, Each ionic species makes a contribution to the conductivity of the solution that depends only on the nature of that particular ion, and is independent of the other ions present.

λ⁰(Al₂(SO4)₃) =  Λ⁰(Al³⁺)  +  Λ⁰(SO4²⁻) 

⇒858  =  x  + 160

⇒x = 858 - 160 =    698 S cm2/mol

hence , your answer is 698 S cm2 /mol