Which organic molecules have the highest calories?

Question

And where would I find information like this Online?

Answer 1

You get the most calories by weight from fats, which have about twice as many calories for a given weight as carbohydrates

Answer 2

It is NOT the calories within the molecule, it is the calories as a result of the net exothermic chemical reactions that happen within the body. There is no such thing as calories within a molecule.

When sugar breaks down into carbon dioxide, water and methane, the heat energy released is better thought of as the difference between the energy resulting in the exothermic reaction, minus any energy required to break them down. You are not looking at the "thermal energy" contained within molecules, but rather the energy released or absorbed by their conversion from one form into another.

There are several equations that are interesting, like those of the Krebs cycle, where conversion of a molecule from one form to another is often accomanied by the energy (calories) released or absorbed by the conversion.

Animals are chemical engines, and the anti-entropy engine of life ends when that life ends. The law of the conservation of energy says that life exists because of the input of outside energy - life consumes energy - until such time as it ends.

Molecules that provide life with the highest energy during their chemical breakdown for mamals are sugar and fat - for mid-atlantic-trence tube worms, it is hydrogen sulfide...

Ron.

Answer 3

Not sure where to find this information.

PER GRAM, methane, when burned and converted to carbon dioxide and water releases the most calories. (ref:wikipedia METHANE)

Answer 4

idk...good luck w/ that