The_Combustion_Of_Alcohlos

The Combustion Of Alcohlos How much heat is given out by alcohols' Plan In this experiment I will test different alcohols to find which gives off the most heat during combustion. The alcohols I am going to test are methanol, ethanol, propanol, butanol, and pentanol. The heat comes from the bonds being broken (endothermic) and made (exothermic). Each bond needs a different amount of energy to break, and release when made. Chemical bond Energy in kJ/mol C-H 413 O-H 464 C-O 336 O=O 498 C=O 805 C-C 347 Bonds breaking in ethanol Number Type Energy In Energy In/kJ 5 C-H 5 X 413 2065 1 C-O 1 X 336 336 1 O-H 1 X 464 464 3 O=O 3 X 497 1491 1 C-C 1 X 347 347 TOTAL ENERGY IN 4703 Bonds that are formed Number Type Energy Out Energy Out 4 C=O 4 X 805 3220 6 O-H 6 X 464 2784 Total Energy Out 6004 Total energy out – total energy in = heat released during combustion 6004 – 4703 = 1301 kJ Here is the heat released during combustion for all the alcohols: Methanol-726 Ethanol-1301 Propanol-2021 Butanol-2675 Pentanol-3328 The alcohols are a homologous series (same general formula, with similar chemical properties). Structure Formula Name H H H-C-O-H CH3OH Methanol H H H H H H-C-C-O-H C2H5OH Ethanol H H H H H H H H-C-C-C-O-H C3H7OH Propanol H H H H H H H H H H-C-C-C-C-O-H C4H9OH Butanol H H H H H H H H H H H H-C-C-C-C-C-O-H heat, water, transferred, results, kj/mol, 42, kj, temperature, weight, same, 1680, energy, different, beaker, time, off, each, ºc temperature, pentanol, because, ºc, moles, increase, end, flame, experiment, bonds, alcohols, 1638, à, test start, sure, out, o2