Question

What mass of Cu(s) is electroplated by running 30.0 A of current through a Cu2 (aq) solution for 4.00 h

Answer 1

The correct answer is "142 g".

Step-by-step explanation:

According to the question,

⇒
`Cu^2+(aq)+2e^ ------> Cu(s)`

where,

Z = 2

F = 96500c

C = 30 A

t = 4h

=
`4* 60* 60`

=
`14400 \ sec`

We know that,

Atomic mass of Cu(M) = 63.5 g/mole

Now,

⇒
`W=(Mct)/(ZF)`

On putting the values, we get

`=(63.5* 30* 14400)/(2* 96500)`

`=(27432000)/(193000)`

`=142 \ g`