energy density and energy per co2

[H3_Internet]

if you got  this question: which has the larger energy density and which produces the least energy for each mole of C02 produced out of Methane an Ethanol how would you work it out?

mod edit: thread title changed

[cameron_15]

Firstly, look at the data sheet to get the required heat of combustion values (delta H).

Then, write out the combustion reactions for each of methane and methanol and apply mole ratios etc to determine relevant info...

Energy density I assume would be kilojoules per gram, so simply divide delta H by the molar mass

Energy per mole of CO2 would be delta H divided by the number of mole of CO2 produced (ie the ratio as per the combustion equation.)

*delta H values are given PER MOLE of hydrocarbon, so when you write out your reaction remember to multiply this given value to achieve delta H of the reaction.