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ENTHALPY OF FORMATION: Combustion of Methanol River Dell High School Team A Jason Anesini Alina Kim Jae Noh.

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Presentation on theme: "ENTHALPY OF FORMATION: Combustion of Methanol River Dell High School Team A Jason Anesini Alina Kim Jae Noh."— Presentation transcript:

1 ENTHALPY OF FORMATION: Combustion of Methanol River Dell High School Team A Jason Anesini Alina Kim Jae Noh

2 PURPOSE To construct an alcohol/hydrocarbon-fueled combustion reactor that propels a stopper upwards To determine the optimal way of measuring the energy released in the combustion reaction To determine the enthalpy of formation of methanol

3 EVERYDAY COMBUSTION Fireworks – Charcoal Car engines – Gasoline

4 COMBUSTION What is combustion? CH 3 OH (l) + 3/2O 2(g) CO 2(g) + 2H 2 O (g) Exothermic ReactionEndothermic Reaction Energy released H p < H r -H rxn Energy absorbed H r < H p +H rxn

5 EXOTHERMIC VS. ENDOTHERMIC

6 ENTHALPY Heat of formation – H when one mole of a compound is formed from its elements – Standard heat of formation Heat of combustion – Heat released in a combustion reaction

7 METHANOL STRUCTURE

8 METHANOL Synthesized from CO and H 2 Used as energy source and in many everyday appliances Lowest E a among alcohols Costs 3x less than ethanol

9 EXPERIMENT APPARATUS Stopper – with green line Methanol (stored in Drierite) Nalgene bottle (500 mL) Insulation – Bubble wrap – Glass fiber Tesla coil – Copper wires

10 EXPERIMENT APPARATUS Rubber Stopper Methanol and Drierite Nalgene Bottle (500mL) Tesla Coil

11 MEASUREMENT APPARATUS 120 f.p.s camera (Sony HDR-SR11) – Meter stick Thermometer Laptop – Temperature probe – Vernier Software: Logger Pro 3.8.4

12 KINETIC ENERGY E = 1/2mv 2 Mass of cork (w/ line) before reaction Film: observe frame-by-frame to find initial velocity

13 KINETIC ENERGY Frame 987 Frame 988

14 HEAT ENERGY q = mC p T VariableAir in BottleBottle MassVolume of bottle and density of air Mass of bottle (without copper wires and insulation) Specific Heat (C p )At the average temperature of 30 0 C Specific heat of LDPE Temperature Change (T) ThermometerTemperature probe (laptop)

15 RESULTS Total energy: kinetic energy & heat energy – Cork – Air in bottle – Bottle Heat energy represented the majority of total energy Equations in appendix were imported into Excel to make the spreadsheet

16 DATA TABLE

17 DATA ANALYSIS Experimental H f of methanol: -535kJ/mol Theoretical H f of methanol: kJ/mol 124% error Small H c results in large experimental H f ΔH c = [ΔH f (CO) + 2ΔH f (H20) ] – [ΔH f (CH3OH) ]

18 COMPLETE VS. INCOMPLETE COMBUSTION CharacteristicComplete Combustion Incomplete Combustion Limiting Reagent MethanolOxygen gas Formula CH 3 OH + 3/2O 2 CO 2 + 2H 2 O CH 3 OH + O 2 CO + 2H 2 O ProductsCarbon dioxide gasCarbon monoxide gas (poisonous)

19 ADDRESSED PROBLEMS Assumption that total energy transferred to cork Bottle warm to the touch after reaction – Insulation to reduce heat loss to environment Limiting reagent of reaction Volume of methanol used (0.4 mL)

20 CONCLUSION Energy not accounted for – Energy escaped from bottle Multiple revisions to the procedure In the future…

21 WORKS CITED Slide 3 – Fireworks. (accessed May 8, 2013). Slide 3 – Car Engine. (accessed May 8, 2013). Slide 5 – Exothermic and Endothermic Reactions. (accessed May 8, 2013). Slide 7 – Methanol Structure. (accessed May 8, 2013). Slide 7 – Methanol Ball-and-Stick Model. (accessed May 8, 2013).

22 TESLA COIL Tesla coils contain a transformer that changes low voltage to high voltage Increases the voltage and frequency When the electrode gets near another surface it discharges onto that surface

23 Incomplete Combustion Assumption: methanol would combust in complete combustion After experiment: methanol combusted in incomplete combustion – Refer to Calculations XII & XIII in Appendix: Part 1


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