AAMC FL #7 Question 51

This forum made possible through the generous support of SDN members, donors, and sponsors. Thank you.

lamborghiniMD

Full Member
10+ Year Member
Joined
Jun 25, 2012
Messages
136
Reaction score
8
Approximately how many moles of Al3+ are reduced when .1 faraday of charge passes through a cell during the production of Al? Assume Al3+ is reduced to Al metal only.

The answer is .033mol, but can anyone show me how you would solve this? I had no idea. I have the paper version so I don't have explanations to answers for this test. Thanks!
 
A faraday is equal to the charge found in one mole of electrons. Given a value expressed in faradays and a reduction half reaction, we have to calculate the number of moles being used up.

Al3+ + 3e– → Al

Based on the half reaction, we know that three electrons are used up for every mole of Al3+ that gets reduced. Next, we can use dimensional analysis to calculate the number of moles of Al3+:
 

Attachments

Top