• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11

Methanol - Bond Energy Calculations

Extracts from this document...

Introduction

Methanol Bond Energy Calculations: Methanol + Oxygen � Carbon dioxide + Water 2CH3OH + 3O2 � 2CO2 + 4H2O = 2 moles of Methanol Structure of Reactors: 2x 6x H H - C - O - H O = O H = H - C x 6 (435) C - O x 2 (358) O - H x 2 (464) O = O x 3 (497) = 5745kj Products: 4x 2x H - O - H O = C = O = C = O x 4 (803) O - H x 8 (464) = 6924kj ?E = 5745kj - 6924kj = -1179/2 = -589.5 kHz/mol Ethanol Bond Energy Calculations: Ethanol + Oxygen � Carbon dioxide + Water C2 H5 + 3O2 � 2CO2 + 3H2O Structure of Reactors: H H H - C - C - O - H H H = H - C x 5 (435) C - O x 1 (358) O - H x 1 (464) O = O x 3 (497) C - C x 1 (347) = 4835kj Products: 2x 3x O = C = O H - O - H = C = O x 4 (803) O - H x 6 (464) = 6996kj ?E = 4835 - 6996kj = -1161 = -1161 kj/mol Propanol Bond Energy Calculations: Propanol + Oxygen � Carbon dioxide + Water 2CH5H7 ...read more.

Middle

This also applies for the fuel to be burned obviously that has to be changed. First, I plan to experiment with the amount of water to be heated in order to gain the clearest temperature difference results. I plan to experiment with 3 different amounts of water; 25, 50 and 75 ml. because I am using 1ml of fuel I am unable to use a beaker other than one that is of 100ml volume due to the fact that a larger beaker would require more than 75ml water in order to submerge the bulb of the thermometer. The results were as follows:- Fuel - Methanol 25ml 50ml 75ml 1 2 1 2 1 2 Start Temp. 21?C 29?C 29?C 27?C 28?C 24?C 23?C This clearly shows that the biggest change in temperature was using 25 ml of fuel, consequently I will use this amount as I believe it will give me the clearest results as well as submerging the bulb of the thermometer. Although I am unable to test any other variables I have thought about them and noted my reasons for particular ones below: Due to the way I will carry out my experiment (see below) I have decided to use a 10 cm diameter watch glass in which to place my fuel for burning, this is because there is a larger surface area for the ...read more.

Conclusion

Also my apparatus is chosen as it is safe, both water and fuel would be hard to spill and the fuel will also be lit safely. Lastly whilst carrying out all experiments in the laboratory I shall stand, enabling me to move quickly if needed. Overall the main safety hazards are getting burnt or by spilling alcohol over bare skin. Prediction: My prediction is based on the molar energy calculations; I have calculated the following. Energy Released per 1 ml Methanol: = -589.5 kj/32g =-18.42 x 0.793 = 14.60j Ethanol: = -1161 kj/46g =-25.24 x 0.789 = 19.91j Propanol: = -1732.5 kj/60g =-28.88 x 0.804 = 23.22j Butanol: = -2304 kj/74g =-31.14 x 0.810 = 25.22j Pentanol: = -2875.5 k/j80g =-32.68 x 0. 815 = 26.63j This shows me that he higher the bond energies the more transferral of heat will take place, due to the increased number of breaking bonds. Also because I am measuring the fuel by ml there are different densities. Therefore effectively there is more Pentanol than Methanol. In short, due to the more carbon atoms the alcohol compound has a higher bond energy and subsequent heat transferral. Task: To investigate how the combustion of 1ml, of at least four alcohols raises the temperature of a particular amount of water. Results: Four tests for each fuel and the average temp rise Fuel Exp. 1 Exp. 2 Exp. 3 Exp. 4 Temp Rise Methanol Ethanol Propanol Butanol Pentanol ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Organic Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Organic Chemistry essays

  1. Investigate the different amounts of energy given off when different alcohols are combusted. I ...

    They still follow suit though. This further follows my prediction. I can safely conclude that the larger the relative mass of an alcohol, the great the enthalpy of it will be. One must remember that my results were only an average of the two repeats.

  2. "Could Sainsbury's add value to their business by using an alternative fuel for their ...

    P Yam Tang and Chan (1998) argued that this was because "public willingness to make sacrifices clearly does not always find expression in action." In other words, the public may be inclined to say that their purchasing behaviour is positively affected by environmental issues18, but whether they translate this concern into actual practice is another matter.

  1. Find out how much energy is required to burn methanol, ethanol, propanol and pentanol, ...

    > Place the beaker into the grasp of the clamp stand. > Record the starting temperature of the water (Usually 16�C) > Weigh the spirit burner with the lid off. > Put the chosen alcohol burner under the beaker allowing the flame to just touch the beaker.

  2. Find out how much energy is required to burn methanol, ethanol, propanol and pentanol, ...

    x 1 358 x 1 (O-O) x 7.5 497 x 7.5 (C-C) x 4 347 x 4 = 10722.5kJ mol-1 Bonds Made (C=O) x 10 802 x 10 (O-H) x 12 464 x 12 =13598kJ mol-1 Total Energy Released: 2875.5kJ mol-1 As you can see a longer molecule takes more energy to break its bonds, in this case Pentanol.

  1. Which Alcohol is the best fuel?

    Apparatus list The equipment I need to perform this experiment is: * A clamp - to hold up the tin can * A tin can - to store the water in * Measuring cylinder - to measure the amount of water accurately * Thermometer - to measure the temperature *

  2. An experiment to investigate the factors that determine the amount of energy released when ...

    be very accurate therefore, there is only one way of measuring the heat given off by the burning alcohol and that is by the heat change it gives to a certain amount of water. I would suspend a beaker containing probably about 30ml of water, I'd measure the temperature of

  1. Physics - Efficiency of a Fuel.

    The bonds that are formed in an exothermic reaction can be of two types. The form of bonding that I lookrd at is covalent where atoms share electrons to complete their outer orbit. An example being Methane where four hydrogen atoms each share an electron with a carbon atom.

  2. GCSE Chemistry Revision Notes - everything!

    The fractionating column, in which the crude oil is heated, is cooler at the top and hotter at the bottom. The crude oil is heated in a furnace and the vapour mixture given off rises up the column and the different fractions condense out at different parts of the column, depending on their boiling points.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work