The limiting value of molar conductance is the sum of the λm∞ values of respective ions in the electrolyte. For an electrolyte of the type AxBy, λm∞ = xλ(A+)∞+yλ(B1−)∞ Here the compound is A2B For A2B → 2A++B2− ∴ λm(A2B)∞ = 2λA+∞+λB2−∞