Question

How much electricity is required in coulomb for the oxidation of :
(a) `1` mol of `H_(2)O` to `O_(2)`,
(b) `1` mole of `FeO` to `Fe_(2)O_(3)` ?

Answer 1

(i)` " " underset(1"mol")(H_(2)O)to 2H^(+)+1//2O_(2)+underset(2F)2e^(-)`
Electricity (charge) required =2F`=2xx96500" C"=1.93xx10^(5)" C"` ltbr. (ii) `" " 2FeO+1//2O_(2) to Ni+2HNO_(3)`.
`underset(2" mol")(Fe^(2+)) to Fe_(2)^(3+)+underset(2F)2e^(-)`
For the oxidation of two moles of FeO, charge required =2F
For the oxidation of one mole of FeO, charge required =1 F =96500 C.