1. A current of 3.0A deposited 2.0g of a metal in 20 minutes. (a) calculate the mass of the metal deposited by 1 faraday. (b) determine the atomic mas of the metals given that it is trivalent. [1 faraday =96500c]

Question

2. A quantity of 3.35g of a certain group III element was deposited by the passage of 10 amperes flowing for 1 hour. calculate the atomic mass of the element. [1 faraday = 96500c]

Answer 1

1a. coulombs = A x seconds = 3 x 20 min x (60 s/min) = 3600 C
2g x (96,500/3600) = ?
1b. 96,500 C will deposit ?grams/3 or 53.61 so
?g/3 = 53.61. Solve for x.

2 is worked similarly.