Investigate the amount of energy released when different fuels burn
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22
27
5
Proponal
20.5
29
9
Butanol
19.5
29
10
Ethanol
21.5
29
8
Table showing the temperature change compared to the amount of carbon atoms in each alcohol
Alcohols
Number of carbon atoms
Temperature change
©
Methanol
1
5
Ethanol
2
8
Propanol
3
9
Butanol
4
10
Amount of energy produced from each alcohol
Energy = Mass of water x 4.2 x Rise in Temperature
Methanol
E = 150 x 4.2 x 5
= 3150 kj
Ethanol
E = 150 x 4.2 x 8
= 5040 kj
Propanol
E = 150 x 4.2 x 9
= 5670 J
Butanol
E = 150 x 4.2 x 10
= 6300 kj
Alcohols
Number of carbon atoms
Energy produced (kj)
Temperature change ©
Butanol
4
6300
10
Propanol
3
5670
9
Ethanol
2
5040
8
Methanol
1
3150
5
Energy produced per gram = Energy evolved
Mass of alcohol
Methanol
3150 / 0.5
= 6300 kj x 32g
= 201.6 per mole/kj
Ethanol
5040 / 0.5
= 10 080 kj x 46g
= 463.680 per mole/kj <...
