Molar conductivity of BaCl2=280Scm2mol−1 Molar conductivity of H2SO4=860Scm2mol−1 Molar conductivity of HCl=426Scm2mol−1 Molar conductivity of BaSO4= ? From Kohlrausch's law, Λm∞(BaSO4)=λmω(Ba2+)+λmω(SO42−)
Λm∞(BaSO4)=Λm−(BaCl2)+Λm∞(H2SO4)−2Λm∞(HCl)
On putting given values we get, =280+860−2(426) =288Scm2mol−1