Question

How many grams of nickel metal are plated out when a constant current of 15.0 A is passed through aqueous NiCl₂ for 60.0 minutes?

Stuff you need: Ni⁺² needs two moles of e^- to form 1 mole of Ni metal; 1 A = 1 Coulomb/sec; 1 mol e- = 96,485 C.  

Answer 1

Current (A) = 15 A

time (t) = 60 min = 60 x 60 = 3600sec

Faraday (F) = 96485 C

Ni atomic weight = 58.69 g / mol

Ni equivalent weight (E) = 58.69 / charge

                                     = 58.69 /2

                                      = 29.34

from faraday's law

w = E x i x t / 96485

w = 29.34 x 15 x 3600 / 96485

w = 16.09 g

weight of Ni metal = 16.09 g