A student set up the apparatus shown in the diagram below to investigate the energy released by different liquid biofuels.
In one experiment, the complete combustion of 385 mg385 \text{ mg}385 mg of butan-1-ol (C4H9OH\text{C}_4\text{H}_9\text{OH}C4H9OH) increased the temperature of 125 g125 \text{ g}125 g of water in the copper calorimeter from 19.1 ∘C19.1\text{ }^\circ\text{C}19.1 ∘C to 39.8 ∘C39.8\text{ }^\circ\text{C}39.8 ∘C.
Calculate a value, in kJ mol−1\text{kJ mol}^{-1}kJ mol−1, for the enthalpy of combustion of butan-1-ol from this experiment. Give your answer to the appropriate number of significant figures.
(The specific heat capacity of water is 4.18 J K−1 g−14.18 \text{ J K}^{-1} \text{ g}^{-1}4.18 J K−1 g−1)