The charge in coulombs that a battery produces when it discharges 250 A for 15.0 s, expressed in scientific notation is a.bc x 10d C. The values of a, b, c and d are
In an electrochemical cell, 150 C of charge is transferred in 1.5 min. The electric current is determined to be _________Answer A.
The time to transfer 1.25 x 103 C using a current of 7.00 A is_____ Answermin
The time to deposit 15.0 g of silver from a silver nitrate solution using a 6.00 A current is__________ Answer__________minutes.
make sure the answers are rounded correctly
5 years ago
Answered By An B
Hi! In this question, you can use Faraday's First Law: Q=I x t with
Q is the amount of electric charge (C)
I is the current (A)
t is the time (s)
Applying the formula,
Answer A= I = Q/t =150/(1.5 x 60) = 1.67 (A)
Answer B= t = Q/I = (1.25 x 10^3)/7 = 178.57 (s) = 178.57/60 (mins) = 2.98 (mins)
Answer C. You have to write the chemical reaction (since there is one happening here).
Ag(s) --> Ag+(aq) + 1e-
nAg(s)= nAg+(aq)=15/107.87=0.139 (mol)
ne- = nAg+(aq)= 0.139 (mol)
We use this equation: Q=n x F= I x t (with F is the Faraday's constant)
--> t= (n x F)/I = (0.139 x 96,485.3365)/6 = 2235.24 (s)
--> t= 2235.24/60 = 37.25 (mins)