Calorimetry exercise 2

The heat capacity of a combustion calorimeter was measured by burning some ethanol in it until a temperature rise of 10.0 ºC was achieved. The mass of the burner fell from 13.539 g to 12.121 g. The calorimeter was now heated up using a hexan-1-ol burner. The mass of the burner fell from 12.829 g to 11.717 g and the temperature rose from 24.6 ºC to 33.7 ºC. Calculate the enthalpy of combustion of hexan-1-ol.

For a challenge, try to answer the next question. What effect would evaporation of alcohols before and after combustion have on your result?

DH_c (ethanol) = - 1367.3 kJ mol^-1

Answer to exercise 2