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

Answer:

The correct answer is "142 g".

Explanation:

According to the question,

⇒ $Cu^2+(aq)+2e^ ------> Cu(s)$

where,

Z = 2

F = 96500c

C = 30 A

t = 4h

 = $4\times 60\times 60$

 = $14400 \ sec$

We know that,

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

Now,

⇒ $W=\frac{Mct}{ZF}$

On putting the values, we get

        $=\frac{63.5\times 30\times 14400}{2\times 96500}$

        $=\frac{27432000}{193000}$

        $=142 \ g$