candle-lab-answers

candle-lab-answers - 3.23.2 kJ/0.65 g = 35 .8 kJ/g 4.35 .8...

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1. 200 g 2.q = cm T = 4.18 J/g°C x 200 g x 29.0°C = 242 44 J or 24.2 kJ 3.24.2 kJ/0.66 g = 36 .7 kJ/g 4.36 .7 kJ/g x 352.77 g/mol = 12 958 kJ/mol or # mol= 0.66 g ÷ 352.77 g/mol=1.8 7x10 3 mol 24.2 kJ/1.8 7x10 3 mol = 12 958 kJ/mol 5. C 25 H 52 + 38O 2 25CO 2 + 26H 2 O + 12 958 kJ 6.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 C 25 H 52 is not entirely correct; 3) incomplete combustion. Data: 0.66 g, 29.0°C
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1. 200 g 2.q = cm T = 4.18 J/g°C x 200 g x 27.8°C = 232 41 J or 23.2 kJ
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Unformatted text preview: 3.23.2 kJ/0.65 g = 35 .8 kJ/g 4.35 .8 kJ/g x 352.77 g/mol = 12 613 kJ/mol or # mol= 0.65 g 352.77 g/mol=1.8 5x10 3 mol 23.2 kJ/1.8 5x10 3 mol = 12 613 kJ/mol 5. C 25 H 52 + 38O 2 25CO 2 + 26H 2 O + 12 613 kJ 6.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 C 25 H 52 is not entirely correct; 3) incomplete combustion. Data: 0.65 g, 27.8C For more lessons, visit www.chalkbored.com...
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candle-lab-answers - 3.23.2 kJ/0.65 g = 35 .8 kJ/g 4.35 .8...

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