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Combustion of Propane Gas

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Introduction

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.

Middle

(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.

Conclusion

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.

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