I need to do a comparison of ethanol as an alternative fuelsource vs gasoline to
ID: 689358 • Letter: I
Question
I need to do a comparison of ethanol as an alternative fuelsource vs gasoline to find which one is better.I need to figure out the energy effectiveness of ethanol as analternative fuel vs. that of gasoline. Also, I must figureout the polluting capacity of ethanol as compared togasoline. The only hints that was given to me was to first find abalanced equation and then use Hesses law to find theenery.
Someplease hep me...thank you I need to do a comparison of ethanol as an alternative fuelsource vs gasoline to find which one is better.
I need to figure out the energy effectiveness of ethanol as analternative fuel vs. that of gasoline. Also, I must figureout the polluting capacity of ethanol as compared togasoline. The only hints that was given to me was to first find abalanced equation and then use Hesses law to find theenery.
Someplease hep me...thank you
Explanation / Answer
Ok, I believe you have to react each with Oxygen gas (O2) becausethat is what happens when driving a car; the fuel is combusted byreacting with oxygen Ethanol=CH3CH2OH Gasoline is not a simple chemical compound like water or ethanol.It is a mixture of hundreds of different compounds. The reason forthis is that gasoline is made from crude oil. Crude oil, orpetroleum, is made up of thousands of different compounds, and theexact compounds present and their relative amounts differ dependingon where the petroleum is produced. (For example, oil produced inWest Texas differs remarkably from oil produced in the MiddleEast.) After the oil is produced (or taken out of the ground viaoil wells), it is shipped to an oil refinery, where it is separatedinto different products, including gasoline, jet fuel, and dieselfuel, among others. A good average is probably octane, whichhas eight carbon atoms and 18 hydrogen atoms and is writtenC8H18. CH3CH3OH +O2= CO2+H20 Now to balance this Gasoline: CH3CH3OH + 2 O2 = 2 CO2+H20 Balanced Gasoline: 2 C8H18 + 25 O2= 16 CO2 + 18 H2O What you have to do is use Hess's law to determine the energy eachone produces. Per mole, which one produces the most energy? Whichone gives off the most CO2 per mole...Gasoline for this one? You can do which one gives the most energy/ CO2 produced per mole.So you do this by using Hess's law to determine the energy eachreaction produces per mole of reactant. Then you divide by thenumber of CO2 produced. For gasoline, CO2 wold be 16, for ethanolit would be 2. This ratio will give you the energy/ pollutant. Also keep in mind that ethanol combusts pretty quickly, so aproblem with using it as a fuel could be that it gives off too muchenergy in one go.
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