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Question : 12
Total: 26
(a) Calculate the mass of Ag deposited at cathode when a current of 2 amperes was passed through a solution of AgNO 3
(Given : Molar mass ofAg = 108 g mol − 1 , 1 F = 96500 C mol − 1
(b) Define fuel cell.
(Given : Molar mass of
(b) Define fuel cell.
Solution:
(a) t = 900 s
Charge = Current × Time = 2 × 900 = 1800 C
According to the reaction
Ag + (aq) + e − → Ag ( s )
We require1 F 1 mol 108 g Ag
For1800 C Ag be =
= 2.0145 g
(b) Fuel cell is the name given to the galvanic cells which are designed to convert the energy of combustion of fuels like hydrogen, methane, methanol, etc. directly into electrical energy.
According to the reaction
We require
For
(b) Fuel cell is the name given to the galvanic cells which are designed to convert the energy of combustion of fuels like hydrogen, methane, methanol, etc. directly into electrical energy.
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