What mass of ni2 + is produced in solution by passing a current of 67.0 a for a period of 14.0 h, assuming the cell is 90.0 % efficient?

When we have the current = 67 coulombs/second

and mol of electrons of Ni2 + = 2

faraday's constant = 96500

molar mass of Ni = 58.69 g/mol

time (sec) = 14 h * 3600

∴ the mass of Ni2 + = 50400 sec * 67 coulombs/second * 1 mol of electrons / 96500 coulombs * 1 mol of Ni / 2 mol of electrons * 58.69 g/mol / mol of Ni

= 1027 g Ni