• 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

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

Extracts from this document...

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.

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

# Related GCSE Organic Chemistry essays

1. ## Investigate the amount of heat released in the burning of fuels: ethanol (C2H5OH), propanol ...

A fair test was maintained by keeping the above variables (apart from type of alcohol) constant in each experiment. Altering the volume of water alters its mass, therefore affecting the equation: mass of water x rise in temp x SHC (specific heat capacity), and affecting the ability of the heat to be conducted.

2. ## To Find Out Which Fuel Gives Out the Most Energy.

Rise in temperature of water (�C) Energy released per gram of fuel (j) 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)

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

All of the other alcohol's can be broken up in this way. Methanol CH3OH + 1.5O2 --> CO2 + 2H20 Bonds Broken (C-H) x 3 435 x 3 (O-H) x 1 464 x 1 (C-O) x 1 358 x 1 (O-O)

2. ## The Energy Content Of Different Fuels

* Then repeat all of the steps above for all the other fuels, Ethanol, Propanol, Butanol, and Pentanol. Making sure that the distance measured between the clamp stand and the bottom of the boiling tube is the same each time, this is to keep the experiment fair by making sure

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

As the number of carbon atoms in a molecule increase the boiling range/?C also increases. This shows that more energy is needed to break up the hydrocarbons with the number of carbon atoms in a molecule increasing. This is why the boiling point increases.

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

I can also work this prediction out using bond energies. I expect these bond energy results to show negative results, which means that the experiment is exothermic and is giving out heat. Although I know I must appreciate that my results will not be entirely accurate as heat will not completely be transferred to heating the water.

1. ## To find out which of these four alcohols: ethanol butanol propanol pentanol is the ...

is called bioethanol. Prediction: Based on my background information I think that pentanol will use the least fuel to heat the water. I think this because pentanol has the most number of carbons in its molecular structure. Therefore it is more reactive and will use less fuel to heat the water.

2. ## Investigation to Find the Relative Energy

Pentanol is quite clearly the alcohol that should release more energy, more than five times as much as Methanol, but my experiment will show whether this extra energy can be put to good use, or if too much is wasted for it to be useful.

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