Hexadecane have more carbon atoms than octane . thus, it burns with a smokier flame than octane . hope it helps :)

Yes, hexadecane, also called cetane, is a hydrocarbon derived from fossil fuels (coal, oil and natural gas). Burning it releases long-hidden carbon dioxide into the atmosphere.

753.243 kg/m^3

I think it's probably petroleum if your thinking of oil fuel or energy if you're thinking physically for humans.

Their molecules are binded stronger to each other than those of water. therefore requiering more energie to break them appart.