Which Fuel Releases the Most Energy Per Mole Measure by Heating Water

Which fuel releases the most energy per mole of energy by heating the water hypothesis In this study it burns alcohol to heat the water in the beaker. We burn 5 types of fuel, methanol, ethanol, propanol, butanol, pentanol. In my study I predicted that alcohol pentanol will release more energy than other alcohols because more energy is released as the alkane chain length is longer. Equipment, distillation stand, jig, measuring cylinder, thermometer, heat-resistant pad, copper can, plywood, chemicals (methanol, ethanol, propanol, butanol, pentanol)

The amount of water in my experiment is always 100 cubic centimeters. In order to calculate the total energy released from each fuel, I use the following formula, because it requires 2 J / kg (which is the specific heat capacity of water) to increase 1 g of water. Water volume C - Specific heat capacity of water (4.2 μg / kg) - Temperature rise (200 ° C) Energy release amount (J) = 100 cm 3 X 2 X 20 = 8400 J Next, using the formula and the number of moles Calculate the emission energy per mole. = Mass / relative molar mass

Scientists know that there are various forms of energy, including sensible heat (we use temperature measurement), radiant energy (as we feel from the sun) and latent heat. Latent heat is more confidential, for example released and absorbed as water changes between ice and liquid water. On a hot summer day, you will experience the power of latent heat. As the sweat of the skin evaporates, it absorbs heat from the transition from liquid water to steam, and in the process it cools you.

How the calorimeter works: Water flows beyond the calorimeter at a certain rate (eg 1 gallon per minute). The measured amount of fuel burns and is released into the water. The water temperature is measured at the time of entrance calorimetry. The temperature difference is the amount of heat contained in the fuel. Liquids and gases do not convey heat well, but you can transfer heat through convection. Please look at the engine on the left. The water transfers heat from the hot engine through the pump and provides it to the radiator responsible for radiating heat to the air. Remember that by convection heat is transferred from one place to another by the transfer of gas or liquid.

Do you want to measure it? H, we must use this energy to heat things, it is water. This assumes that all of the heat (ΔH) generated by the combustion of the fuel is equal to the amount (q) of heat absorbed by the water. So I will measure the energy needed to do this. This can be obtained using the following formula: q = mass X is greater than heat capacity X, temperature rises at 1000. q is heat. The specific heat capacity is the energy required to heat the material using the equation. Calculate, where q is 焓, what is the specific heat capacity? It is temperature rise. I chose to use water because it is safe, easy to obtain and has a constant and reliable specific heat capacity of 2 J / ° C.