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Data: 0.66 g, 29.0°C. 200 g q = cm T = 4.18 J/g ° C x 200 g x 29.0 ° C = 24 2 44 J or 24.2 kJ 24.2 kJ/0.66 g = 3 6 .7 kJ/g 3 6 .7 kJ/g x 352.77 g/mol = 1 2 958 kJ/mol or # mol= 0.66 g 352.77 g/mol=1. 8 7x10 – 3 mol 24.2 kJ/ 1. 8 7x10 – 3 mol = 1 2 958 kJ/mol

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## 200 g q = cm T = 4.18 J/g ° C x 200 g x 29.0 ° C = 24 2 44 J or 24.2 kJ 24.2 kJ/0.66 g = 3 6 .7 kJ/g 3 6 .7 kJ/g

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**Data: 0.66 g, 29.0°C**• 200 g • q = cmT = 4.18 J/g°C x 200 g x 29.0°C = 24244 J or 24.2 kJ • 24.2 kJ/0.66 g = 36.7 kJ/g • 36.7 kJ/g x 352.77 g/mol = 12958 kJ/mol or # mol= 0.66 g 352.77 g/mol=1.87x10–3 mol 24.2 kJ/1.87x10–3mol = 12958 kJ/mol • C25H52 + 38O2 25CO2 + 26H2O + 12958 kJ • The calorimeter is made up of more than just water (e.g. the metal from the can) Sources of error: 1) poor heat transfer (loss of heat, evaporation); 2) wax is a mixture of hydrocarbons so C25H52 is not entirely correct; 3) incomplete combustion. Not: experimental error, inaccurate thermometer**Data: 0.65 g, 27.8°C**• 200 g • q = cmT = 4.18 J/g°C x 200 g x 27.8°C = 23241 J or 23.2 kJ • 23.2 kJ/0.65 g = 35.8 kJ/g • 35.8 kJ/g x 352.77 g/mol = 12613 kJ/mol or # mol= 0.65 g 352.77 g/mol=1.85x10–3 mol 23.2 kJ/1.85x10–3mol = 12613 kJ/mol • C25H52 + 38O2 25CO2 + 26H2O + 12613 kJ • The calorimeter is made up of more than just water (e.g. the metal from the can) Sources of error: 1) poor heat transfer (loss of heat, evaporation); 2) wax is a mixture of hydrocarbons so C25H52 is not entirely correct; 3) incomplete combustion. Not: experimental error, inaccurate thermometer For more lessons, visit www.chalkbored.com

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