The enthalpy change of combustion, ∆Hᶜ, of butane, C₄H₁₀, can be determined using the apparatus shown in Fig. 2.1. [Figure 2.1] The following steps are carried out. step 1 Use a 500 cm³ measuring cylinder to transfer 320 cm³ of water into a metal can. step 2 Place a thermometer into the water. Record the initial temperature of the water in the metal can. step 3 Weigh the gas container with burner and record the initial mass. step 4 Set up the apparatus as shown in Fig. 2.1. step 5 Light the burner and allow the flame to heat the water in the metal can for three minutes. step 6 Switch off the burner and record the maximum temperature reached. step 7 When cool, reweigh the gas container with burner and record the final mass. The results are shown in Table 2.1. Table 2.1 initial temperature of water/°C | maximum temperature of water/°C | change in temperature of water, ΔT/°C | initial mass of gas container with burner/g | final mass of gas container with burner/g | mass of butane burned/g ---|---|---|---|---|--- 19.3 | 76.6 | | 183.56 | 181.46 |