Question

What mass of Cu(s) is electroplated by running 24.5A of current through a Cu2+(aq)solution for 4.00 h?Express your answer to three significant figures and include the appropriate units.

Answer 1

Answer: 116 g of copper

Step-by-step explanation:

`Q=I* t`

where Q= quantity of electricity in coloumbs

I = current in amperes = 24.5A

t= time in seconds = 4.00 hr =
`4.00* 3600s=14400s` (1hr=3600s)

`Q=24.5A* 14400s=352800C`

`Cu^(2+)+2e^-\rightarrow Cu`

`2* 96500C=193000C` of electricity deposits 63.5 g of copper.

352800 C of electricity deposits =
`(63.5)/(193000)* 352800=116g` of copper.

Thus 116 g of Cu(s) is electroplated by running 24.5A of current

Thus remaining in solution = (0.1-0.003)=0.097moles