• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Enthalpy of Combustion of Alchohols

Extracts from this document...

Introduction

Experiment 3: Enthalpy of Combustion of Alcohols ________________ Combustion of Ethanol Reaction: C2H5OH (l) + 3O2 (g) --> 2CO2 (g) + 3H2O (g) Raw Data Processed Data Mass of empty spirit lamp: 38.227 ± 0.001 grams Mass of ethanol: 54.408 – 38.227 = 16.181 ± 0.002 grams Mass of spirit lamp + ethanol: 54.408 ± 0.001 grams Mass of ethanol burnt: 54.408 – 51.283 = 3.125 ± 0.002 grams Final mass after burning: 51.283 ± 0.001 grams Rise in temperature: 40 – 27 = 13 ± 1°C Volume of water = 100 ± 0.5 ml Mass of water: 100 x 1 = 100 grams Initial Temperature = 27 ± ...read more.

Middle

80 kJ mol-1 Error Propagations Uncertainty in mass: Uncertainty in measuring cylinder: Uncertainty in temperature: Total uncertainty: 0.064 + 7.69 + 0.5 = 8.254% Uncertainty in enthalpy value: 8.254% of 80 kJ/mol = ± 6.6032 kJ/mol The percentage error compared to literature value: ïThe standard enthalpy change of combustion of ethanol (with uncertainty) is: -80 ± 6.6032 kJ mol-1 Combustion of Methanol Reaction: 2CH3OH (l) + 3O2 (g) --> 2CO2 (g) + 4H2O (g) Raw Data Processed Data Mass of empty spirit lamp: 36.113 ± 0.001 grams Mass of methanol: 52.435 – 36.113= 16.322 ± 0.002 grams Mass of spirit lamp + ethanol: 52.435 ± 0.001 grams Mass of methanol ...read more.

Conclusion

use this equation: Energy = 4.18 x 100 x 20 = 8360 Joules Mass of ethanol ÷ Molar mass of ethanol ï 5.17 g ÷ 46.06844 g/mol ï 0.11222 moles Assuming that all the heat is transferred to water, the calculated enthalpy of combustion of ethanol is: = 74,496.52468 Joules/mol ï 74.5 kJ mol-1 Error Propagations Uncertainty in mass: Uncertainty in measuring cylinder: Uncertainty in temperature: Total uncertainty: 0.0387 + 5 + 0.5 = 5.5387% Uncertainty in enthalpy value: 5.5387% of 74.5 kJ/mol = ± 4.13 kJ/mol The percentage error compared to literature value: ïThe standard enthalpy change of combustion of methanol (with uncertainty) is: -74.5 ± 7.413 kJ mol-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 International Baccalaureate 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

See related essaysSee related essays

Related International Baccalaureate Chemistry essays

  1. Hesss Law Lab, use Hesss law to find the enthalpy change of combustion of ...

    Therefore, for one mol the energy given out would be: ?H 2 = -1.68 kJ/mol x (1/0.00992) = 169.3 = -1.69 * 102 kJ/mol. ( we have a negative sign because the reaction is exothermic) Enthalpy change of a reaction is the same regardless of what pathway is taken to achieve the products.

  2. Molar Heat combustion chemistry - investigate the effect of molar mass on the molar ...

    Ethanol 1 0.82 2 1.05 3 0.70 4 0.83 5 0.91 1-Propanol 1 0.55 2 0.50 3 0.69 4 0.35 5 0.42 1-Butanol 1 0.61 2 0.49 3 0.61 4 0.61 5 0.63 1-Pentanol 1 0.74 2 0.92 3 0.68 4 0.52 5 0.79 Sample calculation 2.

  1. Thermodynamics: Enthalpy of Neutralization and Calorimetry

    = (851.834 �?????1 cal) + HC (20.2 �.71 C�) (1103.448 � .029 6cal) - (851.834 �?????1 cal) = HC (20.2 �.71 C�) 251.614 �??????cal 251.614 �???????cal= HC (20.2 �.71 C�) 12.456 �.0351cal/C� Specific Heat of Metal Cylinder Mass of Cold Water 76.981 �.001 g -7.848 �.001 g 69.133 �.0014 g Specific Heat of Cylinder (m �?T�s)metal = (m �?T � s)water + (Heat Capacity � ?T)calorimeter (x cal/gC�)

  2. Enthalpy of Combustion of Alcohols Lab

    HARMFUL Wash spillages away with water Methanol HIGHLY FLAMMABLE, Keep away from flames. TOXIC, IRRITANT Wash spillages away with water Variables: Independent variable: Type of Alcohol Dependent variables: * Change in temperature of water * Change in mass of alcohol * Amount of heat energy given out Controlled variables: *

  1. Investigating the enthalpy of combustion

    2. Place the clay triangle on the tripod stand and fit the 100 cm3 beaker into the gap of the clay triangle. 3. Using the digital balance measure the mass of the alcohol along with the cap of the alcohol container (M1).

  2. The aim of this experiment is to examine the enthalpy of combustion of the ...

    90 59.0 58.0 56.0 58.0 105 69.0 67.0 65.0 67.0 120 72.5 73.0 73.0 73.0 135 75.0 74.0 76.0 75.0 150 74.5 73.5 76.0 75.0 165 74.0 73.0 75.0 74.0 180 72.5 72.5 75.0 73.0 210 72.0 75.5 74.5 74.0 Qualitative data Just a little bit of soot was formed on the boiling tube.The color of flame is light orange.

  1. To determine the standard enthalpy of formation of Magnesium Oxide using Hess Law.

    However, under the material and time limitations, this was the best type of calorimeter that could be devised. An example of a more sophisticated calorimeter that could be used is a simple thermos flask which to a large extent minimizes heat loss due to conduction, convection and radiation.

  2. Analysis of the Standard Enthalpy of Combustion for Alcohols

    Equipment: 1. 250 cm3 Conical flask 2. 100 cm3 ± 0.08 cm3 pipette 3. Loggerpro thermometer 4. 5 x different consecutive alcohol spirit burners (eg. methanol, ethanol, propanol, butanol and pentanol) 5. Stand 6. 2 x clamps 7. Scales 8.

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