Solved

Electrolysis of water, an energy cost.

Posted on 2003-11-20
3
1,253 Views
Last Modified: 2006-11-17
 How much electrical energy via electrolysis would it take to create 1 litre of elemental hydrogen mixed with elemental oxygen, and how long would this take?
0
Comment
Question by:craige1
3 Comments
 

Author Comment

by:craige1
ID: 9793362
please state what type of anode and cathode would work best and iff poss some litrature or journals on this subject.
0
 
LVL 84

Accepted Solution

by:
ozo earned 125 total points
ID: 9795744
1 litre of hydrogen at STP is 1/22.4 moles.
the heat of fusion of water is 1436 cal/mole, while the heat of fusion of H2 is 28 cal/mole and O2 is 106.3 cal/mole, the difference is 1355 cal/mole, but you probably won't recover the energy of the O2 recombining
65 cal = 269.5 joules
2/22.4 moles of electrons is 3356 coulombs or 3356 amp seconds
0
 
LVL 22

Expert Comment

by:grg99
ID: 9796994
Theoretical or practical?    

 There are considerable losses that are going to make the theoretical numbers kinda off the mark.

0

Featured Post

How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

Join & Write a Comment

How to Win a Jar of Candy Corn: A Scientific Approach! I love mathematics. If you love mathematics also, you may enjoy this tip on how to use math to win your own jar of candy corn and to impress your friends. As I said, I love math, but I gu…
Foreword (May 2015) This web page has appeared at Google.  It's definitely worth considering! https://www.google.com/about/careers/students/guide-to-technical-development.html How to Know You are Making a Difference at EE In August, 2013, one …
Internet Business Fax to Email Made Easy - With eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

757 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now