It is possible to measure the enthalpy change of combustion, ∆Hc, of ethanol, C2H5OH, using the following apparatus. [Figure 1.1] A student carries out an experiment to determine the value for ∆Hc of ethanol using the following instructions: • Weigh the spirit burner with ethanol and lid, record the starting mass to two decimal places. • Measure 100.00 cm³ of water and place it into the metal can. • Place a thermometer, with 0.1°C graduations, into the water and stir it, wait for 2 minutes. • Record the temperature of the water. • Light the wick and allow the flame to heat the water. • Continue to stir the water using the thermometer. • After the temperature has risen by approximately 20 °C place the lid on the flame to extinguish it. • Record the maximum temperature of the water. • Weigh the spirit burner and record the final mass. The student obtained the following results. initial temperature of water/°C | maximum temperature of water/°C | change in temperature of water, ∆T/°C | initial mass of spirit burner/g | final mass of spirit burner/g | mass of ethanol burned/g ---|---|---|---|---|--- 18.1 | 38.2 | | 153.29 | 152.76 |