And the last problem i want you to advise:
1.9 g of a metal was electrodeposited on the cathode, when electrolysis of the salt of this metal (III) was carried out for 1.5 hour and electric current was 1.8A. Identify the metal.
I couldn't understand one thing, that this is practical mass and i need to find theoretical, but there's no current efficiency and i don't know how to find it. If i had that i could find it, by the formula:
m=E*J*t/96500 and when i calculate E of the metal i can identify it by multiplying by it's valance. So could you help my finding theoretical mass?