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River Dell High School Team B Sharon Galperin Young Kim David Lo ENTHALPY OF FORMATION THE COMBUSTION OF AN ETHANOL- FUELED REACTOR.

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Presentation on theme: "River Dell High School Team B Sharon Galperin Young Kim David Lo ENTHALPY OF FORMATION THE COMBUSTION OF AN ETHANOL- FUELED REACTOR."— Presentation transcript:

1 River Dell High School Team B Sharon Galperin Young Kim David Lo ENTHALPY OF FORMATION THE COMBUSTION OF AN ETHANOL- FUELED REACTOR

2 PURPOSE Understand how enthalpy of formation is used Determine thermochemical properties of reactor, fuel, and oxidant: – Enthalpy of reaction ∆H rxn – Standard enthalpy of formation of ethanol ∆H f ◦ – Structure of fuel – Temperature changes

3 ENTHALPY H = U+PV H, enthalpy U, internal energy P, pressure V, volume Enthalpy of Formation, ∆H f Enthalpy of Combustion, ∆H comb ΔH ° rxn = Σ ΔH ° f (products) - Σ ΔH ° f (reactants)

4 ETHANOL (C 2 H 5 OH) Grain alcohol Renewable liquid biofuel Alternative fuel source to gasoline Made from starch or sugar-based feedstocks Strongly resists knocking behavior with 100 ON in Spark Ignition (SI) Engines in automobiles

5 ETHANOL (CONT.) Intermolecular Forces London Dispersion Forces Dipole-dipole Hydrogen-bonding Asymmetric molecule Polar (Bond triangle) Require higher activation energy (E act )

6 MATERIALS Reaction Chamber Tesla Coil Cork

7 CALCULATIONS X = V ix ∆t V y = V iy +a y ∆t (equation 3) (equation 1) (equation 2) ViVi V ix V iy θ (Resolution of Vectors)

8 DATA TABLE 1: KINETIC ENERGY TrialMass of cork (g) Volume of ethanol (mL) Distance traveled (Meters) V i (m/s) KE (J) % error 112.130.208.24010.980.73 99.95 211.850.2011.0412.810.97 99.93 312.040.2010.6312.560.95 99.93 411.820.2014.9214.971.33 99.91 511.970.2017.2216.121.56 99.89 Average11.960.2012.4113.491.11 99.92

9 DATA TABLE 2: TEMPERATURE CHANGE TrialMass of cork (g) Volume of Ethanol (mL) T initial (K) T final (K) ∆T (K) 111.900.229731316 211.920.229731316 311.830.2297.731113.3 411.950.229831214 511.660.229830911 Average11.850.2297.5311.614.1

10 FINAL ASSUMPTIONS BASED ON EXPERIMENTAL DATA All energy released is transferred to cork Only 0.08% was transferred to cork Inefficiencies Friction Aerodynamic drag Sound Energy Thermal Energy Absorbed by Nalgene bottle Electromagnetic Energy Observe blue flame (Visible Light )

11 FINAL ASSUMPTIONS FROM EXPERIMENTAL DATA (CONT.) Complete Combustion Limiting reactant – O 2 Incomplete Combustion C 2 H 5 OH +2O 2  2CO + 3H 2 O

12 Enthalpy of formation in industry Energy efficiency CONCLUSIONS:

13 CITATIONS: Slide 4 - http://perc.org/articles/should-congress-end- ethanol-subsidies (accessed May 1, 2013).http://perc.org/articles/should-congress-end- ethanol-subsidies Slide 4 - http://www.annualreviews.org.proxy1.library.mcgill.ca/doi/f ull/10.1146/annurev-physchem-040412-110009 (accessed May 1, 2013). http://www.annualreviews.org.proxy1.library.mcgill.ca/doi/f ull/10.1146/annurev-physchem-040412-110009 Slide 5 - http://www.metasynthesis.com/webbook/37_ak/ triangles.html (accessed May 1, 2013).http://www.metasynthesis.com/webbook/37_ak/ triangles.html Slide 12 - http://www.international-issues.org/the-khilafahs- energy-policy/ (accessed May 1, 2013).http://www.international-issues.org/the-khilafahs- energy-policy/


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