Combustion of Biodiesel DATA Initial mass of biodiesel lamp Trial 1 Trial 2 Tria

Question

Combustion of Biodiesel DATA Initial mass of biodiesel lamp Trial 1 Trial 2 Trial 3 2.0.9 ! 20,ul 21.4U 20.1ug 20.e 0225 21.0°C 198mL H,o Final mass of biodiesel lamp iofieInitial temperature qm Final temperature 20.0? 21.0°C of calorimeter 17.0°C | 30.0°C | 30.0°C of calorimeter CALCULATIONS Change in temperature of calorimeter Energy absorbed by calorimeter (based on Ccal calculated above) Change in mass of biodiesel lamp AHcomb of biodiesel in kJ/g Trial 1 Trial 2 Trial 3 10°C 0.5 0.355 0.39 grams of biodiesel burned Average AHcomb of biodiesel _kJ/g

Explanation / Answer

Trial 1

Average heat capacity of calorimeter

Ccal = 2.938 kJ/°C

Energy absorbed by calorimeter = Ccal x change in temperature in the combustion of biodiesel

= 2.938 kJ/°C x 6°C

= 17.628 kJ

H comb of biodiesel = 17.628 kJ/0.5g = 35.256 kJ/g

Trial 2

Average heat capacity of calorimeter

Ccal = 2.938 kJ/°C

Energy absorbed by calorimeter = Ccal x change in temperature in the combustion of biodiesel

= 2.938 kJ/°C x 10°C

= 29.38 kJ

H comb of biodiesel = 29.38 kJ/0.35g = 83.94 kJ/g

Trial 3

Average heat capacity of calorimeter

Ccal = 2.938 kJ/°C

Energy absorbed by calorimeter = Ccal x change in temperature in the combustion of biodiesel

= 2.938 kJ/°C x 9°C

= 26.442 kJ

H comb of biodiesel = 26.442 kJ/0.39g = 67.8 kJ/g

Average H comb of biodiesel

= (35.256 + 83.94 + 67.8) /3

= 62.332 kJ/g

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