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Observation - Alcohol No. Of Carbon atoms per Alcohol Initial Mass Final Mass?

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Introduction

Observation Alcohol No. Of Carbon atoms per Alcohol Initial Mass Final Mass? Mass (g) Initial Temperature Final Temperature? Temperature ?H/g (kJ/g) ?H/mol (kJ/mol) Methanol 1) 2) 3) Average) 1 243.34g 238.59g 236.46g 238.59g 236.46g 233.94g 4.75g 2.13g 2.52g 17�C 16�C 18�C 52�C 54�C 50�C 34�C 35�C 38�C 3.006 6.901 6.333 96.2 220.8 202.7 211.8 Ethanol 1) 2) 3) Average) 2 234.96g 217.36g 205.17g 232.2g 213.79g 201.02g 2.76g 3.57g 4.15g 16�C 17�C 19�C 51�C 60�C 52�C 35�C 43�C 33�C 5.326 5.059 3.340 245.0 232.7 153.6 238.9 Propanol 1) 2) 3) Average) 3 203.61g 201.35g 242.21g 201.35g 199.54g 240.52g 2.26g 1.81g 1.69g 19�C 18�C 23�C 50�C 50�C 54�C 31�C 32�C 31�C 5.761 7.425 7.704 345.7 445.5 462.2 453.85 Butanol 1) 2) 3) Average) 4 197.7g 196.26g 194.63g 196.26g 194.63g 192.31g 1.44g 1.63g 2.32g 15�C 19�C 18�C 47�C 51�C 50�C 32�C 32�C 32�C 9.333 8.245 5.793 690.6 610.1 428.7 650.35 So as you can see by my results Butanol has the highest enthalpy of combustion.? ...read more.

Middle

There is no major trend on these graphs apart from there is an uprising slope this is due to the fact the enthalpy of combustion increased from Methanol to Butanol but there is a slight anomalous result on the green line at propanol it should be higher than Ethanol but in fact it is not. For every extra Carbon atom in the alcohol, more moles of Carbon dioxide and Water are formed per mole of alcohol and more energy is released per mole of alcohol as the number of Carbon atoms increased. C=O bond = 743 and C-H bond = 412 this means that more energy is released as bonds formed than the bonds breaking so there is a higher DH This conclusion actually agrees with my prediction at the start of the experiment however the results do not although there is still a relationship between the number of Carbon atoms and the enthalpy of Combustion so I am 50% right although there is one major anomalous result. ...read more.

Conclusion

The experiment was not carried out in the idealist of conditions and heat was lost in the surrounding atmosphere. This was due to windows being opened and closed causing draughts to distract the heat supply and the people in the room were carrying out movements which also caused convection currents. As I have said my results are not perfect but the graph was the same shape which can help me support my conclusion. Improvements which could be made is that the experiment could be done in a room where there are little occupants to try and stop draughts and a room that there are no windows or all of them are closed and could not be open for the same reason. More accurate balance could be used to ensure the best possible results. Also we could use the same spirit burner throughout to ensure there are no faults with the rest and that we should get the same results out of them all. ...read more.

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