Presentation on theme: \"Determining the Molar warmth of combustion for Paraffin\"— Presentation transcript:




You are watching: Heat of combustion of paraffin wax

1 Determining the Molar warmth of combustion for ParaffinBackground: similar to specific heat capacity, Molar heat is the lot of energy required come raise one mole of the problem 1°C. Water deserve to be provided to catch the energy released in the kind of heat from the candle wax. Molar heat: J/mol°C

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2 Data to collect: Volume the water _____Initial mass of candle _________ last mass the candle _________ Mass melted _________ initial temperature of water _________ last temperature the water ________ ΔT __________ course averages: fixed of water provided _______ massive of candle wax melted __________ change in temperature (ΔT) ________

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3 Calculations and Questions:What massive of water was supplied in this lab (note: the density of water is 1 g/mL)? using individual and class averages, calculate the heat absorbed by the water (assume c = 4.18 J/g°C). Assume the the heat soaked up by the water is same to the heat offered off by the candle. Calculation the amount of heat released per gram of wax (i.e. The details heat that combustion). Paraffin wax has actually the formula C25H52. Calculate the amount of warm released every mole the wax (i.e. Calculation the molar warmth of burning for paraffin). Compose the thermochemical equation that represents the combustion of paraffin wax. In inquiry three, 4.18 J/g°C was supplied as the certain heat volume of the calorimeter.

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Suggest a factor why this is not totally accurate. What other sources of error room there in this lab?

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5 Accepted Molar Enthalpy (Heat) of burning for ParaffinKJ/g = 14,600-14,800 KJ/mol 12-15 MJ/mol = 10/10 MJ/mol = 9/10 8-9.9 MJ/mol = 9/10 listed below 8 MJ/mol = 7/10

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