How many grams of Cu are obtained by passing a current of 12 A through a solution of for 15 minutes?
A)0.016
B)3.6
C)7.1
D)14
E)1.8

Question

How many grams of Cu are obtained by passing a current of 12 A through a solution of  for 15 minutes?
A)0.016 
B)3.6 
C)7.1 
D)14 
E)1.8

Quizplus · Accepted Answer

First, we need to use Faraday's Law of Electrolysis, which states that the amount of substance produced at an electrode is directly proportional to the amount of electricity (in Coulombs) passed through the cell and the electrochemical equivalent (in g/Coulomb) of the substance.

We can calculate the amount of electricity passed through the cell using:

Q = I × t

where Q is the charge in Coulombs, I is the current in Amperes, and t is the time in seconds. Since we are given the current in Amperes and the time in minutes, we need to convert the time to seconds:

t = 15 min × 60 s/min = 900 s

So the charge passed through is:

Q = 12 A × 900 s = 10800 C

Next, we need to determine the electrochemical equivalent of Cu. This can be found on a reference table and is 0.000329 g/Coulomb for Cu.

Now we can calculate the amount of Cu produced:

Grams of Cu = electrochemical equivalent × charge

Grams of Cu = 0.000329 g/Coulomb × 10800 C = 3.5532 g

However, we need to convert the grams to the requested unit of measure (which is not given, but appears to be in the unit digit place):

Grams of Cu = 3.6 g (rounded to one decimal place)

Therefore, the answer is B: 3.6.

How Many Grams of Cu Are Obtained by Passing a Current