Question

Two voltameters, one having a solution of silver salt and the other of a trivalent-metal salt, are connected in series and a current of 2A is maintained for 1.50hours. It is found that 1.00g of the trivalent-metal is deposited. (a) What is the atomic weight of the trivalent metal? (b) How much silver is deposited during this period? Atomic weight of silver is 107.9g/mole.

Answer 1

w₁ = zit 

=> 1 = mm/(3 x 96500 x 2 x 1.5 x 3600)  => mm = (3 x 96500)/(2 x 1.5 x 3600)  = 26.8g/mole

E₁/E₂ = w₁/w₂ => 107.9/(mm/3) = w₁ = (107.9 x 3)/26.8 = 12.1gm