Combustion of Alknols

Topics: Specific heat capacity, Thermodynamics, Mole Pages: 3 (1021 words) Published: February 6, 2011
Combustion of Alkanols
Aim: Theory: To find the molar heat of combustion for three different alkanols. Specific Heat Capacities: Water – 4.18 Aluminium – 0.89 *Courtesy of Conquering Chemistry, Roland Smith, 2005. Published values of Molar Heat of Combustions Ethanol 1364 kJ mol-1 1-Propanol 2016 kJ mol-1 1-Butanol 2677 kJ mol-1 *Courtesy of SI Chemical Data, Alward, GH & Findlay, TJV, 1974, Jacaranda. Molar Weight of Alkanols: Ethanol 46.06844 1 – Propanol 60.09501 1 – Butanol 74.12158 *Courtesy of KRW's Solutions Assistant Software, Version 2.0.8 Equipment: • • • • • • • • • • • Method: 1. Recorded mass of empty aluminium can. 2. Set up retort stand. 3. Attached one set of boss head and clamp to retort stand and hung thermometer to it. 4. Attached other set of boss head and clamp to retort stand slightly lower. 5. Added Approx 200ml of water to aluminium can and re-weighed. 6. Hung aluminium can and insulation from second clamp. 7. Recorded temperature of water. 8. Recorded mass of the ethanol spirit burner. 9. Lit ethanol spirit burner and placed under aluminium can. 10. Allowed temperature of the water to rise by approximately 15 degrees celcius. 11. Recorded temperature. 12. Extinguished flame and re-weighed ethanol spirit burner. 13. Determined mass of ethanol combusted. 14. Used mass and specific heat capacity of both water and aluminium to calculate combined specific heat capacity. Combustion of Alkanols – Craville Studies Page 1 of 3

Ethanol Spirit Burner 1-Propanol Spirit Burner 1-Butanol Spirit Burner Electronic Balance Aluminium can insulated with cardboard and tin. Retort stand Boss head x 2 Clamp x 2 Thermometer Water Matches

15. Used ?H = -mC?t formula to calculate heat produced. 16. Converted value to energy per mole. Results: Test Ethanol #1 Ethanol #2 1-Propanol #1 1-Propanol #2 1-Butanol #1 1-Butanol #2 Mass of Can (g) 11.85 11.85 11.85 11.85 11.85 11.85 Mass of Can + Water (g) 194.21 260.77 221.46 213.44 230.70 226.87 Mass At Start...
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