Question

a solution containing cu2+ ions was electrolyzed for 30 minutes using a current of 3 ampere. what mass of cu would be deposited​

Answer 1

Note that 1 A = 1 C/s, and that 30 min = 1800 s. Compute the number of coulombs that pass.

Compute the total number of electrons after looking up how many electrons constitute a coulomb.

Each deposited copper atom absorbs two electrons (since the copper sulfate is presumably CuSO₄). From this, and from the total number of electrons, compute the number of atoms.

Using Avogadro’s number, compute the number of moles.

Look up the molar mass of copper and compute the number of grams.