[Fastlane51]

This is assuming the desity of Octane is .699g/mL and Ethanol is .785g/mL.
I have already done this I just want to check my answer

molecular weight of Octane: 114.2g
                           Ethanol: 46.07g

And what is the mass produced per liter?

Thanks for any help

[Borek]

Well, one gives 1500 g, second 2154 g. Compare to your results and you will know if they are OK.

[Fastlane51]

Oh well I got 1499.86g for CH3CH2OH
and 2154.57g for C8H18

HAHA I promise I am not trying to use this to get homework down, its just that I saw a website that claimed that 1 liter of octane produces more heat than 1 liter of ethanol, so it got me doubting the rest of my calculations.
I think the website must be wrong because everything I did was right

I got that ethanol produced -6.028KJ/g
and octane produces -2.189KJ/g
as well

sooo i am sure that website is wrong....

[Borek]

My bet - without checking any numbers - is that octane gives more energy both per mass and per volume.