I am not sure what delta hf is, but from Wikipedia article on Dinitrogen
Pentoxide:
http://en.wikipedia.org/wiki/Dinitrogen_pentoxide
--------
Dinitrogen pentoxide is the binary nitrogen oxide N2O5, also known as
nitrogen pentoxide. This unstable and potentially dangerous oxidizer was
once of interest as a reagent for nitrations but it has largely been
superseded by NO2BF4, which is more stable and effects the same reactions.
N2O5 exists as colorless crystals that sublime at 32.4 °C. The salt
decomposes at room temperature into NO2 and O2.
-----------
If one could get energy by burning nitrogen, then some bacteria would
have figured out how to do it a billion years ago.
--
Paul Studier <STUDIER2atpleasenospamtoPAULSTUDIERdotCOM>
When you work, you create.
When you win, you just take from the loser.
For an explanation, see http://paulstudier.com/win
Larry Snyder wrote:
> Hi All
> I have tried for years to get friends to develop a free energy source that
> is fairly easy to do. The basic idea is to burn nitrogen.
Burnt nitrogen is seriously toxic.
Graham
Yup. If bacteria a billion years ago had been able to
get their cilia on N2O5, they could have lived on the
energy yielded by its decomposition -- its as-above-noted
spontaneous decomposition. The price Larry Snyder is asking
is too high.
--- G. R. L. Cowan, boron combustion fan
http://www.eagle.ca/~gcowan/Paper_for_11th_CHC.html :
a tradition of suggesting boron spanning millennia
> Larry Snyder wrote:
> > Hi All
> > I have tried for years to get friends to develop a free energy source that
> > is fairly easy to do. The basic idea is to burn nitrogen. The CRC rubber
> > book 71st edition, page 5-43 shows n2o5 delta hf to be 10.3. Page 5-35 shows
> > h2o to be 57.1. Translation: nitrogen delivers about 1/6 the energy of
> > hydrogen(per volume). This is enough to run cars or what ever. No one seems
> > interested. I think it is too important to let fall through the cracks.
> > The n/o ratio needs to be modified from the present 80/20 to about 20/80. A
> > way to do this is by using oxygen concentrator technology. Aluminum silicate
> > will absorb nitrogen under pressure and not oxygen. There are companies that
> > make high volume nitrogen concentrators. Modification to their filters would
> > probably work.
> > Any one who wants to do this has my blessings. I expect nothing as
> > compensation. Good luck
> >
> >
>
> I am not sure what delta hf is
It is the energy of formation. More precisely, it is the difference in
energy content between the separate elements and that of the compound
formed by them.
S.
Any one who wants to do this has my blessings. I expect nothing as
> compensation. Good luck
And you'll get nothing from the effort, as 'burning' nitrogen
is highly endothermic and produces very poisonous byproducts.
The idea is completely wrong.
--Damon
From
http://webbook.nist.gov/cgi/cbook.cgi?ID=C10102031&Units=SI&Mask=1#Thermo-Gas
we find that the heat of formation of N2O5 is 11.3 kJ/mol when formed
from Nitrogen and Oxygen. This is in the vapor phase and is close to
the value you quote. Note that it is positive, that is, it REQUIRES
11.3 kJ/mol to form. Compare with H2O at:
http://webbook.nist.gov/cgi/cbook.cgi?ID=C7732185&Units=SI&Mask=2#Thermo-Condensed
where the heat of formation is -285.830 kJ/mol. This is negative which
means energy is RELEASED when water is formed from Hydrogen and Oxygen.
This is why Nitrogen fertilizer is energy intensive to make and many
Nitrogen compounds are used as explosives.
Older thermochemical tables such as the one in my CRC do include
a negative DH_f for the solid phase, sometimes called nitronium nitrate,
NO2NO3.
But its exothermic formation from N2 and O2 is excessively
entropy-reducing,
so the free energy change, the DG_f, is positive;
Snyder is hung up on failure to understand that a spontaneous reaction,
capable of doing work, can have products *colder* than reagents --
2 N2O5(room 'T') ---> 2 N2 + 5 O2
The N2 and O2 are colder than room 'T', but still much more voluminous
at room pressure than the salt that produced them.
So N2O5 decomposition can raise a piston.
Pushing it back down will, however, just compress the N2/O2 mixture.
--- G. R. L. Cowan, former hydrogen fan
That's the Titan Missle that used UDMH ( Unsymetrical Dimethyl Hydrazine)
and N2O4....The Atlas used kerosene and LOX.