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Finding The Energy Given Off From Various Fuels Essay

Essay Topic:

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Research Question:

> Which of these fuels (ethanol, methanol and butanol) releases the most kinetic energy per ringitt?

Hypothesis:

> Ethanol will release the most kinetic energy per ringitt because it has an average amount of CH compounds (

Materials:

> Spirit burner with ethanol 3 aluminum cans

> Spirit burner with methanol Logger Pro

> Spirit burner with butanol Insulated container

> Matches Ring Stand

> Graduated Cylinder 150mL of water

Procedure:

1. Pour 50mL of water into the first aluminum can

2. Place the can 7cm above the ground on the ring stand

3. Place the Logger Pro inside of the can

4. Light the spirit burner of the fuel under the can.

5. Close the container around the ring stand and the spirit burner

6. Stir the Water inside of the can constantly.

7. Record the temperature of the water for 3 minutes.

8. Repeat the steps for each type of fuel.

9. Find the number of kilojoules released by each of the fuels

10. Find the amount of kilojoules of each fuel when there is 1 liter of that fuel.

11. Divide the amount of kilojoules/litre by the cost/litre of each fuel.

12. Choose the fuel with the most kilojoules released per litre.

Data Collection and Processing:

Ethanol:

Measuring the Mass of Ethanol

Time Alcohol Container Was Burnt

Mass of Alcohol Container (g)

Before Burning

160.2

After Burning

158.9

Measuring Temp. of Ethanol

Time

Temp of Fuel (�C)

Before Bunrning

24.6

After Burning

93.8

Methanol:

Measuring the Mass of Methanol

Time Alcohol Container Was Burnt

Mass of Alcohol Container (g)

Before Burning

191.4

After Burning

190.1

Measuring Temp. of Methanol

Time

Temp of Fuel (�C)

Before Bunrning

25

After Burning

60.8

Butanol:

Mass of Alcohol Container (g):

Methanol:

Ethanol:

Butanol:

Before burning

191.4

160.2

190.8

After burning

190.1

158.9

190.5

Temp of fuel C

Methanol:

Ethanol:

Butanol:

Before burning

25

24.6

23.8

After burning

60.8

93.8

44.8

Finding the Energy Released by The Fuels (Q = m x C x ?T)

Step 1: Finding the ?T (change in temperature)

> ?T= ending temperature – starting temperature

Step 2: Finding the Heat Capacity of Water (C )

> Heat capacity of water = 4.18 J/g

Step 3: Find the mass of water

> Each can had 50mL of water

> 1mL = 1 g

> Each can had 50 g of water

Energy released by Ethanol:

Q= 50 x 4.18 x 69.2

Q= 14.5 kilojoules

Energy Released by Methanol

Q= 50 x 4.18 J/g x 35.8

Q= 7.5 kilojoules

Energy Released by Butanol:

Q= 50 x 4.18 J/g x 21

Q= 4.4 kilojoules

Energy Released by ethanol per ringitt:

Kilojoules/litre = 11153.8

Energy Released by Methanol per ringitt:

Kilojoules/litre = 5769.2

Energy Released by Butanol per ringitt:

Kilojoules/litre = 14666.7

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