Questions by uyost - Page 11
Burning Fuel. 100ml of water Empty cane = 9.33g Fuel Fuel sample initial mass, units(g) Fuel sample final mass, units (g) Water mass, units(g) Initial temperature, t1, units(C) Final (max) temperature, t2, units(C) Ethanol Burner 72.96 71.39 98.87 22 60 Candle 7.85 7.49 98.87 21 40 temperature change T for ethanol burner = final - initial = 60-22 = 38 temperature change T for candle = final - initial = 40-21 = 19 1) calculate the heat absorbed by the water, q, using the equation q = Cpmt, where q is heat, Cp is the specific heat capacity, m is the mass of water (not of the fuel sample, it is water whose change of temperature you were recording), and t is the change in temperature. For water, Cp is 4.18 J/gK. Convert your final answer to kJ. This heat was transferred to the water from the burnt fuel. Calculate the energy content (in kJ/g) of each fuel sample (divide kJ by the final-initial mass of the food in g). Finally, calculate the %efficiency in both trials of the experiment. The accepted heat of combustion of paraffin is 41.5 kJ/g, and for ethanol the value is 30.0 kJ/g. Fill in the table with the values you obtained. Fuel Heat produced, J Heat Produced, kJ Energy Content, kJ/g %efficiency name include calculations include calculations name What is the Fuel with the highest energy content? And why?