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Complete Combustion of Butanol


aommaster

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i have got these bond energies:

Butanol 5580 (total)

Water 928

Carbon Dioxide 1210

oxygen 498.3

 

When i work out the total bond energies on both sides, it shows me that the complete combustion of Butanol is ENDOTHERMIC!!!! Whats wrong with my calculation

 

C4H9OH + 6O2 ----------> 4CO2 + 5H2O

 

14149.8 11080

 

See?

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well, honestly to tell you, i havent a clue what you are talking about!!! But all i know, is that the butanol we are using has a formula of C4H9OH

 

P.S i read ur question on the smallest movement that is detected and i have a question, Why do u ask impossible-to-answer questions :) lol

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LOL, well in reverse order, it`s not an impossible question, there has to be some threshold for this movement idea.

 

Next, lets have a look at your formula....

C4 H9 OH well we can re-shuffle those a little as there`s 2 piles with H in it :)

 

C4 H10 O1

 

and we have as many Oxygens as we can use in our air too :)

 

we can make 4 lots of CO2 using 8 O from the air

 

and 5 lots of H2O using 4 lots of O from the air and remaining Oxygen in our fuel.

 

total air usage to combust 1 molecule of butanol would be 8 oxygen from the Air.

 

leaving 4 parts CO2 and 5 parts water

and completely combusted... can you work from there?

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aommaster said in post #5 :

so is the balanced equation:

 

c4h9oh + 8o2 ------------> 4co2 + 5h20

 

?????

 

4x CO2 (that`s 4xO2)

5x H2O (that`s 5xO... or 2xO2 and just a single O)

 

don`t forget the fuel contains ONE of the O atoms :)

 

I count 13 O ATOMS from the air, or 6 O2 molecules and 1 ATOM.

and one used from the fuel making it 7O2 :)

 

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there`s 2 schools of thought about that in all honesty. for instance Phosphourous Pentoxide is often writen as P2O5 when in fact the molecule is P4O10.

so that`s entirely up to you, whichever works best and remains factual at the same time, is great :)

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ok, so then, i'll divide it by 2 since my chemistry teacher tells be to simplify it. Thanx, and in case u were wondering y i was a total idiot, it was because im only in year 11, and balancing formulas as complex as this, i have not practiced

 

lol

 

:)

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