Results: Weight of Water Alcohol(g) Temp(c) Before After Difference Before After Difference Molar in Weight in temp mass E1 291.608 290.295 -1.313 19 65.5 46.5 46.06 E2 290.295 288.96 -1.335 19 64 45 46.06 E3 288.96 287.628 -1.332 18 74 56 46.06 B1 266.872 266.227 -0.645 18 50 32 74.12 B2 266.227 265.551 -0.676 19 44 25 74.12 B3 266.551 264.869 -1.682 18.5 53 34.5 74.12 B4 264.869 264.218 -0.651 19 60 41 74.12 H1 271.731 271.302 -0.429 18 45 27 102.17 H2 271.302 270.814 -0.488 18 39 21 102.17 H3 270.814 270.327 -0.487 18.5 50 31.5 102.17 M1 250.841 249.415 -1.426 20 69 49 32.04 M2 249.415 247.995 -1.42 19 65 46 32.04 M3 247.995 246.464 -1.531 19 70 51 32.04 Above shows the values taken from the practical. E stands for ethanol. B stands for butanol. H stands for hexanol. M stands for methanol. Enthalpy equations for Ethanol In a complete combustion when ethanol combusts it produces water and carbon dioxide. Methanol + Oxygen Carbon dioxide + Water (Unbalanced) C2H6O + O2 CO2 + H2O (Balanced) C2H6O + 3O2 2CO2 + 3H2O Ethanol temperature change (ΔT) = 46.4, 45, 56 Mass of Ethanol burnt = -1.313, -1.335, -1.332 Molar mass of Ethanol = 46.06 Trail 1 Moles of Ethanol burnt = = =-0.0285 mol Enthalpy change during combustion = Mass of water x heat capacity of water x Temperature change
Results: Weight of Alcohol(g) Water Temp(c) Before After Difference in Weight Before After Difference in temp Molar mass E1 291.608 290.295 -1.313 19 65.5 46.5 46.06 E2 290.295 288.96 -1.335 19 64 45 46.06 E3 288.96 287.628 -1.332 18 74 56 46.06 B1 266.872 266.227 -0.645 18 50 32 74.12 B2 266.227 265.551 -0.676 19 44 25 74.12 B3 266.551 264.869 -1.682 18.5 53 34.5 74.12 B4 264.869 264.218 -0.651 19 60 41 74.12 H1 271.731 271.302 -0.429 18 45 27 102.17 H2 271.302 270.814 -0.488 18 39 21 102.17 H3 270.814 270.327 -0.487 18.5 50 31.5 102.17 M1 250.841 249.415 -1.426 20 69 49 32.04 M2 249.415 247.995 -1.42 19 65 46 32.04 M3 247.995 246.464 -1.531 19 70 51 32.04 Above shows the values taken from the practical. E stands for ethanol. B stands for butanol. H stands for hexanol. M stands for methanol. Enthalpy equations for Ethanol In a complete combustion when ethanol combusts it produces water and carbon dioxide. Methanol + Oxygen Carbon dioxide + Water (Unbalanced) C2H6O + O2 CO2 + H2O (Balanced) C2H6O + 3O2 2CO2 + 3H2O Ethanol temperature change (ΔT) = 46.4, 45, 56 Mass of Ethanol burnt = -1.313, -1.335, -1.332 Molar mass of Ethanol = 46.06 Trail 1 Moles of Ethanol burnt = = =-0.0285 mol Enthalpy change during combustion = Mass of water x heat capacity of water x Temperature change
enthalpy_prac.docx