Hello everyone!
I have a paper I need to deliver about the energy a gasoline driven car releases, particularly the Gibbs Free Energy.
The molecule I've chosen is Octane. My balanced chemical formula is 2C8H18(l) + 25O2(g) → 16CO2(g) + 18H2O(g) | (Assuming complete combustion)
I've calculated entropy and enthalpy based on 1 mol of octane, which is dH= -5074kJ and dS= 483.4 J K-1.
Now I need to calculate the Gibbs Free Energy (dG). I tried doing that by using the standard temperature of 298.15 K and the formula dG = dH - TdS, but I got that wrong. (Delivered the paper once, got it back with a note saying I had to use the reaction temperature and not 25C). So my question is this - how do I calculate the reaction temperature? Or is there perhaps a list of "
standard combustion temperatures" ?
I need to deliver the paper by tomorrow, which means I need help as soon as possible
Thank you!