Question

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?

Answer 1

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

Answer 2

The mass of nickel produced in a 90 % efficient cell is 929 g.

What is an electrochemical cell?

A electrochemical cell is one in which chemical energy is converetd to electrical energy by a chemical reaction.

The reaction occurs as follows;

Ni^2+(aq) + 2e -----> Ni(s)

If 59 g of Ni is deposited by (2 * 96500) C

x g of Ni is deposited by (0.90 * 14 * 60 * 60 * 67) C

x = 59 g *  (0.90 * 14 * 60 * 60 * 67)/ (2 * 96500)

x = 179308080/193000

x = 929 g

The mass of nickel produced in a 90 % efficient cell is 929 g.

Learn more about cells: https://brainly.com/question/2637015