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Calculating Δ H f θ from combustion data - PowerPoint PPT Presentation


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Calculating Δ H f θ from combustion data. Find Δ H f θ of ethyne C 2 H 2 given the following combustion data Δ H c θ C 2 H 2 (g) = -1300 kJmol -1 C (s) = -394 kJmol -1 H 2 (g) = -286 kJmol -1

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slide1

Calculating ΔHfθ from combustion data

  • Find ΔHfθ of ethyne C2H2 given the following combustion data
  • ΔHcθ C2H2(g) = -1300 kJmol-1
  • C (s) = -394 kJmol-1
  • H2(g) = -286 kJmol-1
  • Find ΔHfθ of propan-1-ol C3H7OH given the following combustion data
  • ΔHcθ C3H7OH (l) = -2010 kJmol-1
  • C (s) = -394 kJmol-1
  • H2(g) = -286 kJmol-1

Ans: +226kJmol-1

Ans: -316kJmol-1

slide2

Calculating ΔHrθ from formation data

  • Calculate ΔHrθ for the following reaction:
  • CH2=CH2(g) + H2(g) CH3CH3(g)
  • ΔHfθethene = +52kJmol-1
  • ΔHfθethane = -85kJmol-1
  • Calculate ΔHrθ for the reaction:
  • CaCO3(s) CaO(s) + CO2(g)
  • ΔHfθCaCO3= -1207kJmol-1
  • CaO = -635kJmol-1
  • CO2 = -394kJmol-1

Ans: -137kJmol-1

Ans: +178kJmol-1