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

    Findings from detailed analyses of available fuel sources suggest that natural gas is the most attractive replacement for Sainsbury's diesel fleet. Analysis of both the NPV and Payback methods of investment appraisal conclude that switching to natural gas is a viable investment project that will increase shareholder wealth.

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

    investigate, I must try to keep all of the other influential variables constant. These include the amount of water used in the beaker for heating; the distance between the burning alcohol and the beaker; and the position of the burning alcohol under the water, whether directly under the heating water

  1. Physics - Efficiency of a Fuel.

    Too little Oxygen will result in more Carbon Monoxide and Carbon being produced. Carbon may become deposited on the bottom of the beaker - further reducing efficiency. A longer molecule takes more energy to break its bonds, in this case Butanol, compared to a smaller molecule, Methanol which requires less energy to do so.

  2. Which Alcohol is the best fuel?

    Replace block and time the experiment for two minutes exactly using a stopwatch. 6. As the experiment is in progress, stir the water in the tin can with the thermometer throughout the experiment. Be careful to ensure that the thermometer doesn't touch the bottom or the sides of the

  1. The aim of this investigation is to compare the enthalpy of the following different ...

    For example, octane (C8H18) is one of the main constituents of petrol. Alkanes with 18 or more carbon atoms are solids at room temperature. The table shows the first four members of the alkanes: Alkane Molecular formula Structural formula Methane CH4 H H C H H Ethane C2H6 H H

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

    I predict that the smaller carbons will burn with a smaller flame thus giving out less energy. Therefore the liquids with the more numbers of carbons for example Butanol and Pentanol will burn with a much larger flame thus giving out more energy.

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

    Using the List below I shall also be able to calculate the energy required to burn a certain alcohol. TYPE OF BOND ENERGY REQUIRED TO BREAK THE BOND(j) C - H 410 C - O 360 O - H 510 O = O 496 C = O 740 C -

  2. GCSE Chemistry Revision Notes - everything!

    They occur in rhombus-shaped crystals. The individual molecules are in rings of 8 atoms. Rhombic crystals can be obtained by dissolving powdered sulphur in the toxic solvent carbon disulphide, followed by evaporation. Monoclinic sulphur is obtained when rhombic sulphur is heated up and then cooled.

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