Question

a current of 4 ampere was passed for 2 hours through a solution of copper sulphate solution when 5 gram of copper what deposited calculate the current efficiency ​

Answer 1

Answer:

Explanation:

5 amperes is 5 coulombs per second, 5C/s

So the total charge in 30 minutes is Q = 5C/s x 30min x 60s/min = 9000C

Then the number of moles of copper plated out (n) is:

n = Q/zF where z is the number of electrons in the half-cell reaction (in this case, 2) and F is the Faraday constant = 96,485/mol

So, n = 9000/(2x96485) = 0.0466mol

And this is 63.546 x 0.0466 = 2.96g

So 2.96 grams are plated deposited at the cathode.