A student wanted to find the enthalpy of combustion of propan-1-ol and collected the…

CHEMISTRY · Multi-part · A Level · Chemistry · Energetics · Energetics

Problem

A student wanted to find the enthalpy of combustion of propan-1-ol and collected the following data:


Initial mass of burner and propan-1-ol / $\text{g}$	45.65
Final mass of burner and propan-1-ol / $\text{g}$	45.05
Mass of water heated / $\text{g}$	210
Initial temperature of water / $^\circ\text{C}$	23.7
Final temperature of water / $^\circ\text{C}$	41.5
Specific heat capacity of water / $\text{J K}^{-1}\text{ g}^{-1}$	4.18

(a) Calculate the amount, in mol, of propan-1-ol burnt. (b) Calculate the heat absorbed, in kJ, by the water. (c) Determine the enthalpy change, in

\text{kJ mol}^{-1}

, for the combustion of one mole of propan-1-ol. (d) Suggest why this value differs from the literature value of

-2021\text{ kJ mol}^{-1}