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

Combustion of Propane Gas

Extracts from this document...


Omar Alayoub Block 4 February 23, 2009 IB HL Chemistry Year 1 ?H of Combustion of Propane Gas Research Question: To design a lab in order to find the enthalpy change of combustion of Propane Gas. Equation: C3H8+ 5O2 -->3CO2 + 4H2O ?HC = ? Materials: * Propane Gas * Water * Graduated Cylinder * Beaker * Bunsen Burner * Tripod * Thermometer (Max --> 100�C) * Stopwatch * Matches Variables: * Manipulative: o Volume of Propane (cm3 ) * Responding: o Temperature change of water (C�) * Controlled: o Water o Time (s) Procedure: 1. Measure 100 cm3 of water using a graduated cylinder. 2. Pour the water into a beaker. 3. Place the beaker over the tripod. 4. Turn the gas on, and light the Bunsen burner. 5. Record the initial temperature of the water. 6. Place the beaker over the Bunsen burner and leave it heat for 1 minute. ...read more.


(Per mole) o Q= 12.0kj ?HC = Q/mol ?HC = 12.0kJmol 0.013mol = 923.0 kJ * Yet, this combustion is exothermic (releases heat) o Making it a negative answer. * ?HC = - 9.23 x 102 kJ/mol Uncertainties: (using the Data Booklet) Uncertainties: Thermometer: � 0.5�C Beaker: � 0.5 ml Stopwatch: �0.04 sec Graduated Cylinder: � 2.5 cm3 Uncertainty for final temperature: (0.5?C/23?C) x 100 � 2.17% Uncertainty for n = PV RT = 2.19 + 2.17 = �4. 36% Uncertainty for volume of water: (2.5cm3/100cm3) x 100 2.50% Uncertainty for Change of temperature: (0.5?C/29?C) x 100 = 1.72 % Uncertainty for Q=mc?T: = 2.50 + 1.72 = �4.22 % Uncertainty for ?HC = Q/mol: = 4.36 + 4.22 * ?HC = - 9.23 x 102 kJ/mol � 8.58% Percentage Error * Using the data booklet we could find the error. * Percentage error of the literature value of the Enthalpy change of combustion. ...read more.


This tremendously affects the uncertainty because when the beaker heated with the Bunsen burner, most of the heat was able to escape, causing a shortage of energy. Since the combustion of propane is exothermic, meaning that it releases heat, contradicts the experiment because when the water is heated it looses most of its energy. Subsequently, another error would be that the pressure could have been different, however in this case the pressure was the R.T.P (23�C). Moreover, other errors this we encountered has to deal with the percent uncertainties these materials produce that affect the end result. As an individual uncertainty it won't affect the experiment, however, with all the uncertainties combined it makes a drastic change. To encapsulate, this experiment was more of a demonstration to explain how an experiment can have errors, which can drastically change the results. In this case, there are several ways of improving. * Find the exact pressure measurement using the barometer. * Find the exact density using pycnometers. * Use materials that have lower uncertainties. ...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. Enthalpy of Combustion Lab Report

    disturb the digital thermometer in any possible way as even a small disturbance could affect the temperature readings obtained. Safe Test: 1. One used safety glasses and goggles while conducting the experiment to protect oneself from any chemical hazards. 2.

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

    So RU(n) = � 2.5 % RU(?H2)=RU(Q) + RU(n) RU(?H2) = 2.5% + 14.5% = 17 % Then AU(?H2)=( ?H1* RU(?H1)/ 100) AU(?H2 )= (17/100)* 169KJ/mol = � 29 kJ/mol Absolute uncertainty for ?H react 1: As the uncertainty of ?H3 is set to zero because of it being a given value, the AU(?H react)

  1. Enthalpy of Combustion of Alcohols Lab

    x 100 2676 kJ/mol = 84.0 % CONCLUSION Therefore, from our experimental data and through data processing, we are able to determine the molar enthalpy of combustion of the three alcohols; methanol, ethanol and butan-1-ol. The molar enthalpies of combustion increase as the molecule becomes larger and this corroborates with my hypothesis and proves it right.

  2. Enthalpy Change Design Lab (6/6)How does changing the initial temperature (19C, 25C, 35C, and ...

    or 1.00 mol dm-3 KOH(aq) so that the base of the temperature probe is touching the base of the 150 cm3 beaker. 9. The temperature readings of both Vernier LabQuest LoggerPro data collection units were monitored, and once one of the solutions of either 40.0 cm3 of 1.00 mol dm-3 KOH(aq)

  1. Heat of Combustion Lab

    However we are not accurate as the machine so we might didn't blow out it when it reaches exactly 35�C. Also it was difficult to measure the highest temperature of it after we blow it out. Even though we kept watching it, the temperature changes so quickly, so our measurements are not correct 100%.

  2. Chemistry extended essay - investigate the effect of 2-bromo-2-methyl propane concentration and temperature of ...

    And since nucleophilic only participate in the fast second step, so their relative molar concentrations rather than their nucleiophilities are the primary product - determining factor, and by using nucleophilic solvent like water, so its high concentration will assure that alcohols are the major product, and because water have a high dielectric constant (e=81)

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

    Qualitative data Mass of methanol Mass 1 Mass 2 Mass 3 Average mass Initial mass g ± 0.01 133.47 136.52 138.42 136.13 Final mass g ± 0.01 132.15 135.31 137.39 134.95 Mass of methanol used g ± 0.02 1.32 1.21 1.03 1.18 Ethanol ( C2H5OH ) Time ( s )

  2. Analysis of the Standard Enthalpy of Combustion for Alcohols

    Apparatus: temperature probe datalogger device 5 cm 25 cm alcohol lamp loggerpro collector on computer heatproof mat 100 cm3 distilled water conical flask clamp clamp Variables: 1. Independent The alcohol used to heat water will be changed, however all alcohols will be primary.

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