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Enthalpy changes

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Question 6

Propan-1-ol, C3H7OH\text{C}_3\text{H}_7\text{OH}C3​H7​OH, can be used as an alternative liquid fuel. A student uses a simple copper calorimeter to determine the experimental enthalpy change of combustion of propan-1-ol, ΔcH(C3H7OH)\Delta_c H(\text{C}_3\text{H}_7\text{OH})Δc​H(C3​H7​OH).

Experimental Results

ParameterValue
Volume of water in the calorimeter250 cm3250\text{ cm}^3250 cm3
Mass of propan-1-ol spirit burner before burning145.82 g145.82\text{ g}145.82 g
Mass of propan-1-ol spirit burner after burning144.98 g144.98\text{ g}144.98 g
Initial temperature of water19.1 ∘C19.1\ ^\circ\text{C}19.1 ∘C
Maximum temperature reached43.9 ∘C43.9\ ^\circ\text{C}43.9 ∘C

Determine the enthalpy change of combustion of propan-1-ol, ΔcH(C3H7OH)\Delta_c H(\text{C}_3\text{H}_7\text{OH})Δc​H(C3​H7​OH), 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