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# Investigating which fuel will give out the most energy

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Introduction

Investigating which fuel will give out the most energy Aim To investigate which of 6 fuels will give out the most energy. Plan We will be burning six fuels in a spirit burner to heat a beaker holding 100ml of water in it. For each fuel, we will measure the starting temperature of the water before we heat it, and then measure the temperature of the water at the end of the investigation. The change in temperature between these two readings will allow us to work out how much energy has been released by the fuel using the formula: Mass of water x 4.2 x temperature change = energy transferred from the fuel to the water Apparatus * Tin Can * 100ml Water * Spirit Burner * Clamp Stand * 6 Fuels * Thermometer * Top-pan Balance * Ruler Method 1. Set up the equipment as shown above and add one of the fuels to the spirit burner, making sure that the wick of the burner is 4cm from the base of the can. ...read more.

Middle

Prediction We are using the following fuels. Each fuel is listed with its chemical formula. Methanol - C2H5OH Ethanol - C3H7OH Propanol - C3H7OH Butanol - C4H9OH Pentanol - C5H11OH Hexanol - C6H13OH The fuels with more Hydrogen atoms contain more stored energy. When the fuel is burnt, this energy is released and used to heat up the water. We can calculate the amount of energy released because we know how much energy is stored in each type of bond. In the table below, - indicates a single bond and = indicates a double bond. A mole is the molecular mass in grams. Type of bond (element - element) Energy in bond (kilojoules per mole) C - C 348 C - H 412 C - 0 360 C = O 805 O - H 463 O = O 498 By using the balanced formula of the reaction that takes place as the fuel combusts, we can find out how much energy has been released from each fuel. ...read more.

Conclusion

Rise in temperature of water (�C) Energy released per gram of fuel (Kj) 1st 0.35 10 12000 2nd 0.35 8 9600 3rd 0.77 * 12 6546 4th 0.62 16 10839 Average 0.44 11.3 10813 Propanol Mass of fuel burnt (g) Rise in temperature of water (�C) Energy released per gram of fuel (Kj) 1st 0.68 26 16059 2nd 0.88 26 12409 3rd 0.64 20 13125 4th - - - Average 0.73 24 13864 Butanol Mass of fuel burnt (g) Rise in temperature of water (�C) Energy released per gram of fuel (Kj) 1st 0.52 24 19385 2nd 0.49 16 13714 3rd 0.47 14 12511 4th - - - Average 0.49 27 15203 Pentanol Mass of fuel burnt (g) Rise in temperature of water (�C) Energy released per gram of fuel (Kj) 1st 0.31 9 12194 2nd 0.37 9 10216 3rd 0.34 9 11118 4th - - - Average 0.34 9 11176 Hexanol Mass of fuel burnt (g) Rise in temperature of water (�C) Energy released per gram of fuel (Kj) 1st 0.31 9 12194 2nd 0.43 13 12698 3rd 0.36 12 14000 4th - - - Average 0.37 11.3 12964 1 Bijay Purakaaystha 11B1 11.2 ...read more.

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