Enthalpy Change of Combustion

In this prove, the information that was collected was not reason to being satisfactory as the final calculation yielded enthalpies of electrocution of -7966.1±5.70% for attempt 1, -8303.5±8.44 for attempt 2 and -7190.9kJ±8.78for Trial 3. These results are a far cry from the metaphysical or accepted esteem of -13316.4kJ/mole for the enthalpy diverseness of combustion. Using the part geological fault formula, the percentage wrongful conducts calculated for this experiment was 44% for Trial 1, 38% for Trial 2 and 46% for Trial 3. These huge percentages of error indicate a broken yield of enthalpy ex transpose of combustion of eicosane. Therefore, it is agreed that this particular(prenominal) calorimetric procedure to determine and calculate enthalpy heighten of combustion of eicosane is a flaw one.\nSince the rack up thermic naught set (q total) of the trials rises with an increase in magazine, there is a proportional relationship between time and total thermal brawniness of the system. This makes sense as the total thermal energy values depend on the temperature change which will rise as more time is enceinte for the water molecules to absorb thermal energy. However, the grinder enthalpies of combustion remain fairly constant which is because the view of full melted increases as time increases too. When the total thermal energy of the system is shared by the total moles of wax melted, a constant molar enthalpy of combustion should be obtained. However, an increased duration meliorate the range of uncertainties of measurements calculated. This is because majority of the incredulity is from the disbelief of measurement of temperature development the thermometer. With a bigger temperature change, the uncertainness will have a smaller impact percentage wise and will go away a smaller subjugate in terms of uncertainty in the final results. The raise of this was that Trial 3, the shortest trial, had the highest uncertainty of ±8. 78%, Trial 2 had an uncertainty of ±8.44 and Trial 1, the longest trial, had th... If you want to redeem a full essay, prepare it on our website:

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