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Enthalpy changes

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Question 9

Butane, C4H10\text{C}_4\text{H}_{10}C4​H10​, is commonly used as a fuel in portable camping stoves. A student carries out an experiment using a simple calorimeter setup to determine the enthalpy change of combustion of butane, ΔcH(C4H10)\Delta_c H(\text{C}_4\text{H}_{10})Δc​H(C4​H10​).

Experimental Results

ParameterValue
Volume of water in the beaker150 cm3150\text{ cm}^3150 cm3
Mass of butane burner before burning120.450 g120.450\text{ g}120.450 g
Mass of butane burner after burning120.082 g120.082\text{ g}120.082 g
Initial temperature of water20.20 ∘C20.20\ ^\circ\text{C}20.20 ∘C
Maximum temperature reached48.70 ∘C48.70\ ^\circ\text{C}48.70 ∘C

Determine the enthalpy change of combustion of butane, ΔcH(C4H10)\Delta_c H(\text{C}_4\text{H}_{10})Δc​H(C4​H10​), in kJ mol−1\text{kJ mol}^{-1}kJ mol−1.

  • Assume the density of water is 1.00 g cm−31.00\text{ g cm}^{-3}1.00 g cm−3 and its specific heat capacity, ccc, is 4.18 J g−1 K−14.18\text{ J g}^{-1}\text{ K}^{-1}4.18 J g−1 K−1.
  • Give your answer to 3 significant figures.
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Enthalpy changes Questions

  1. A Level
  2. /Chemistry
  3. /Enthalpy changes