Stoich is.....

[Les Newell]

Stoich is when the end result is as fully reacted as possible
The ideal reaction for methane is
1 CH4 + 2 O2  -> 1 CO2 + 2 H2O
Both CO2 and H2O are stable and will not easily react further.

If you have too much fuel you end up with:
2 CH4 + 3 O2  -> 2 CO + 4 H2O
CO will easily react with oxygen.

If you have too much oxygen you end up with:
2 CH4 + 5 O2  -> 2 CO2 + 4 H2O + O2
The O2 will obviously react with any fuel available

In practise of course the reactions are not as clear cut as the mixture
never fits the equations perfectly so you will get combinations of the above
reactions depending on the exact air/fuel mix.

Les

>
> then it's not an equation, both sides still have to equal each other.
> Right, just means the first definition given is wrong.
> Bruce
>
> From: "Les Newell" <les at lnewell.screaming.net>
> Subject: Re: Stoich is.....
> > Yes, overall there are still the same number of atoms going down the
> exhaust
> > as come in throught the intake. However, if the air/fuel ratio is not at
> > stoich then there will be spare atoms that don't fit into the equation,
so
> > you will have unburnt fuel or unused oxygen.
> > Les
>
> > > Unless your turning mass into energy, the number of atoms will always
> > > balance.  least to my way of thinking
> > > Bruce
>
> > > From: <A70Duster at aol.com>
> > > Subject: Stoich is.....
> > > > Stoich is.....when there is a balance of elements on the left side
and
> > > right side of the "equation" Methane and oxygen (unbalanced)
> > > >
> > > > CH4 +  O2  ->  CO2 + H20
> > > >
> > > > The stoichiometric equation is when the number of atoms on the left
> > equal
> > > the number of atoms on the right. so
> > > >
> > > > 1 CH4 + 2 O2  -> 1 CO2 + 2 H2O
> > > > Seldom is there 100% complete combustion.
> > >
> > >
> >
>
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