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To Find Out How Much Energy Is Given Out by Methanol, Ethanol,Propanol, Pentanol and Butanol.

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Introduction

James McMullen Science Chemistry coursework Burning Fuels Aim The aim is to find out how much energy is given out in methanol, ethanol, propanol, pentanol and butanol. Prediction I predict that pentanol will give out the most energy because it has the most carbon atoms. I think the more carbon atoms there are, the more energy is required to break the bonds. Methanol - CH3OH CH3OH 1/2O2 CO2 + 2H2O 3 x C - H 3 x 410 = 1230 1 x C - O 1 x 360 = 360 1 x O - H 1 x 460 = 460 1 1/2 X O=O 1 1/2 x 496 = 744 + 2794kj 2 x C=O 2 x 740 = 1480 4 x O - H 4 x 460 = 1840 + 3320 2794 - 3320 = -526kj Ethanol - C2H5OH C2H5OH + 3O2 2CO2 + 3H2O 1 x C - C 1 x 350 = 350 5 x C - H 5 x 410 = 2050 1 x C - O 1 x 360 = 360 1 ...read more.

Middle

7 1/2 x 496 = 3720 + 10450kj 10 x C=O 10 x 740 = 7400 12 x O-H 12 x 460 = 5520 + 12920kj 10450 - 12920 = -2470kj Apparatus * Two clamps * Clamp stand * Thermometer * Copper can * Spirit burner Spirits 1. Methanol 2. Ethanol 3. Propanol 4. Butanol 5. Pentanol * Measuring cylinder * Digital scales * Splint Method Firstly attach the clamps onto the clamp stand, and then to the top clamp, attach the thermometer allowing the thermometer readings to be visible. Fill the copper can with 100cm3 of water and attach the copper can to the bottom clamp. Move the copper can up so the end of the thermometer is about 1cm away from the bottom of the copper can. The thermometer must not touch the copper can, only the water. Weigh the first spirit burner with the first fuel on the digital scales, leaving the spirit burner lid on, so there is no loss of fuel by evaporation, and record the weight. ...read more.

Conclusion

3780kj / 0.2g = 3779.8g Conclusion I was right in saying that the more carbon atoms there are, the more energy is required to break the bonds. I can prove this because Pentanol has the most carbon atoms, and when it is burnt it gives out the most amount of energy. Methanol gives out the least amount of energy because it has the least number of carbon atoms in it. The order of how much energy each fuel gives of. 1. The most, 5. The least: 1. Pentanol 2. Butanol 3. Propanol 4. Ethanol 5. Methanol Evaluation To improve the way I carried out the experiment I could have repeated the experiment more than once. You could also use a Bomb Calorimeter, so water is completely surrounding the flame and no energy is given off. As the water is being heated you could use a stirrer so the all the water would be the same temperature, and not different in parts. If I pumped oxygen through the Bomb Calorimeter under the water where the flame is, the flame would burn to its full potential. ?? ?? ?? ?? - 1 - ...read more.

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