The `lamda^(@)` values of NaCl and `NanO_(3)` are 126.5 and `121.6S" "cm^(2)mol^(-1)` respectively. The `lamda^(@)` value of `NO_(3)^(-)` ion is 76.3 S `cm^(2)mol^(-1)` calculate `lamda^(@)(Cl^(-))`.

Explanation

`lamda_(m)^(@)(NaNO_(3))=lamda_(m)^(@)(Na^(+))+lamda_(m)^(@)(NO_(3)^(-))`
`lamda_(m)^(@)(Na^(+))=lamda_(m)^(@)(NaNO_(3))-lamda_(m)^(@)(NO_(3)^(-))`
`lamda_(m)^(@)(Na^(+))=121.6-76.3)S" "cm^(2)mol^(-1)`
`lamda_(m)^(@)(Na^(+))=45.3S" "cm^(2)mol^(-1)`
`lamda_(m)^(@)(NaCl)=lamda_(m)^(@)(Na^(+))+lamda_(m)^(@)(Cl^(-))`
`lamda_(m)^(@)(Cl^(-))=lamda_(m)^(@)(NaCl)-lamda_(m)^(@)(Na^(+))`
`=(126.5-45.3)S" "cm^(2)mol^(-1)`
`=81.2S" "cm^(2)mol^(-1)`