Enthalpy Change of Combustion

In this experiment, the data that was smooth was not close to universe satisfactory as the terminal calculation cave ined enthalpies of fire of -7966.1±5.70% for struggle 1, -8303.5±8.44 for running 2 and -7190.9kJ±8.78for visitation 3. These results are a faraway cry from the theoretical or accepted value of -13316.4kJ/ seawall for the atomic number 1 change of electrocution. development the region error formula, the percentage errors seemd for this experiment was 44% for tryout 1, 38% for trial 2 and 46% for Trial 3. These huge percentages of error imply a low yield of enthalpy change of combustion of eicosane. Therefore, it is determined that this particular calorimetric procedure to determine and calculate enthalpy change of combustion of eicosane is a flawed one.\nSince the add together caloric force determine (q intact) of the trials rises with an increase in age, there is a proportional descent between time and total thermal energy of the system. Thi s makes adept as the total thermal energy values calculate on the temperature change which exit rise as much time is giving for the peeing molecules to absorb thermal energy. However, the milling machinery enthalpies of combustion remains plumb constant which is because the mass of ascend melted increases as time increases too. When the total thermal energy of the system is divided by the total moles of wax melted, a constant molar enthalpy of combustion should be obtained. However, an increase duration improved the draw of uncertainties of measurements calculated. This is because majority of the suspense is from the uncertainty of measurement of temperature using the thermometer. With a bigger temperature change, the uncertainty willing have a smaller impact percentage quick-scented and will give a smaller number in terms of uncertainty in the final results. The evidence of this was that Trial 3, the shortest trial, had the highest uncertainty of ±8.78%, Trial 2 had a n uncertainty of ±8.44 and Trial 1, the agelong trial, had th... If you want to get a full essay, order it on our website:

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