Current efficiency is defined as the extent of a desired electrochemical reaction, divided by the theoretical extent of the reaction times 100%. What is the current efficiency of an electrodeposition of Cy metal in which 9.8g Cu is deposited by passage of 3A current for 10000 seconds.

Options

A. 0.009
B. 0.499
C. 0.991
D. 0.511

Answer

C

Explanation

`9.8g Cu=(9.8)/(63.5) xx 2=0.308" mol e"^(-1)`
`1000 xx 3 xx 1/(96500)=0.311" mol e"^(-1)`
If 0.311 mol electrons provided by the current 0.308 mol was used to deposit copper. The current efficiency is `(0.308)/(0.311) xx 100 =99.1%`