A-LevelChemistryChemical energetics9701/12 · Oct/Nov 2014 · Q71 Mark
In an experiment to calculate the enthalpy change of combustion of a fuel, 1.5g (0.0326 mol) of the fuel was used to heat 200 g of water. The temperature of the water rose from 25°C to 55°C. The specific heat capacity of water is 4.18 Jg⁻¹K⁻¹. There is significant heat loss in this experiment. Therefore, the experimental value for the enthalpy change of combustion, ∆H_c, of the fuel will be different from the theoretical value. Using the information above, what is the experimental value for the enthalpy change of combustion, ∆H_c, of the fuel?
A-1410 kJ mol⁻¹
B-769 kJ mol⁻¹
C-30.7 kJ mol⁻¹
D-16.7 kJ mol⁻¹
✓ Correct answer
B: -769 kJ mol⁻¹
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