Question

The molar conductances of `NaCl,HCl and CH_(3)COONa` at infinite dilution are 126.45, 426.16 and 91`ohm^(-1)cm^(2)mol^(-1)` respectively. The molar conductance of ` CH_(3)COOH` at infinite dilution is:-
A. `201.28ohm^(-1)cm^(2)mol^(-1)`
B. `390.71ohm^(-1)cm^(2)mol^(-1)`
C. `698.28ohm^(-1)cm^(2)mol^(-1)`
D. `540.48ohm^(-1)cm^(2)mol^(-1)`

Answer 1

Correct Answer - B
`(^^)_(m)^(@)(CH_(3)COOH)`
`=(^^)^(@)(CH_(3)COONa)+(^^)^(@)(HCl)-(^^)^(@)(NaCl)`
`=91+426.16-126.45=390.71ohm^(-1)cm^(2)mol^(-1)`