Stoichiometry of reaction

  • Thread starter gfd43tg
  • Start date
  • #1
gfd43tg
Gold Member
953
49

Homework Statement


There's no problem statement, I'm doing this as part of my project

For degradation of food wastes to methane, the general formula is given for food waste (without sulfur)

##C_{n}H_{a}O_{b}N_{c} + (n - \frac {a}{4} - \frac {b}{2} + \frac {3c}{4})H_{2}O \rightarrow (\frac {n}{2} + \frac {a}{8} - \frac {b}{4} - \frac {3c}{8})CH_{4} + (\frac {n}{2} - \frac {a}{8} + \frac {b}{4} + \frac {3c}{8})CO_{2} + cNH_{3}##

However, for my purpose I need to include sulfur, so my formula should be
##C_{n}H_{a}O_{b}N_{c}S_{d}##

Homework Equations




The Attempt at a Solution


This part with the N and S are easy, but figuring out the other stuff is of course my issue.
##C_{n}H_{a}O_{b}N_{c}S_{d} + (...)H_{2}O \rightarrow (...) CH_{4} + (...)CO_{2} + cNH_{3} + dH_{2}S##
 

Answers and Replies

  • #2
Borek
Mentor
28,822
3,340
CH4 and CO2 don't change.

Can't say whole equation makes much sense to me, it looks rather arbitrary.
 
  • #3
gfd43tg
Gold Member
953
49
I imagine they would change, since you are using hydrogen to make H2S instead of going into CH4, right? This is a pseudo reaction of course, I'm trying to model solid wastes to methane from anaerobic digestion without having to model all the many reactions involved in a real digestion
 
  • #4
Borek
Mentor
28,822
3,340
OK, you are right, they are not independent.
 
  • #5
21,631
4,912
What you do is call x the coefficient of H2O, y the coefficient of CH4, and z the coefficient of CO2. Then you do an atom balance on H, C, and O. This gives you three linear algebraic equations in the three unknowns x, y, and z. Just solve for these unknowns.

Chet
 
  • #6
gfd43tg
Gold Member
953
49
What you do is call x the coefficient of H2O, y the coefficient of CH4, and z the coefficient of CO2. Then you do an atom balance on H, C, and O. This gives you three linear algebraic equations in the three unknowns x, y, and z. Just solve for these unknowns.

Chet
Thanks, now time to crank out the algebra
 

Related Threads on Stoichiometry of reaction

  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
6K
  • Last Post
Replies
1
Views
4K
  • Last Post
Replies
3
Views
4K
Replies
2
Views
3K
Replies
6
Views
5K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
6
Views
4K
Top