A bettery is constructed of Cr and Na_(2)Cr_(2)O_(7). The unbalanced chemical equation when such a battery discharges is following: Na_(2) Cr_(2) O _(7)+ Cr+ H^(+)to Cr^(3+) +H_(2)O+ Na^(+) If one Faraday of electricity is passed through the battery during the charging, the number of moles of Cr^(3+) removed from the solution is

A bettery is constructed of Cr and Na_(2)Cr_(2)O_(7). The unbalanced c

1.	A bettery is constructed of Cr and Na_(2)Cr_(2)O_(7). The unbalanced chemical equation when such a battery discharges is following: Na_(2) Cr_(2) O _(7)+ Cr+ H^(+)to Cr^(3+) +H_(2)O+ Na^(+) If one Faraday of electricity is passed through the battery during the charging, the number of moles of Cr^(3+) removed from the solution is
Answer» `4/3` `1/3` `3/3` `2/3` SOLUTION :REDUCTION half reaction : `Cr _(2) O_(7)^(2-) +6E^(-) +14H^(+) to 2Cr^(3+) +7H_(2)O` Oxidation half reaction : `Cr to Cr^(3+) +3E ^(-)` Overall reaction : `Cr_(2) O_(7)^(2-) +Cr+ 14 H^(+)+3e^(-) to 3Cr^(3+) +7H_(2)O` 3F of electricity =3 moles of `Cr ^(3+)` If of eleclricity `=3/3` moles of `Cr ^(3+)`