Answer Happy

You are working in the Department of Energy, and you are presented with a proposal that suggests that liquefied petroleum gas (LPG) is an excellent and climate-friendly alternative transportation fuel to gasoline. You are asked to assess the feasibility of replacing gasoline as a fuel for cars with LPG. LPG is a mixture of gases that may contain primarily butane, primarily propane or a more even mixture. The questions that follow will guide your thought processes, using your chemical and thermochemical knowledge. For this exercise, you can assume that the LPG consists of pure propane, C3Hs. 1a. You wish to determine the amount of heat produced by the reaction of propane with oxygen. You are given the enthalpy changes of some known reactions: 1. 3C(s) (graphite) + 4H₂ (g) → C3Hs (g) ΔΗ, 2. C(s) (graphite) + O₂(g) → CO₂ (g) AH₂ 3. H₂(g) + O2(g) → H₂O (1) AH3 Combine reactions 1,2 and 3 to form a series of steps that sum to the combustion of propane: C3H8 (g) + 5 O₂ (g) → 3CO₂ (g) + 4 H₂O (1) Then, using Hess's Law, write AHxn for the combustion in terms of AH₁, AH, and AH, ΔΗ, Ξ b. Given the following values for the enthalpy changes, calculate AHxn for the combustion of propane. AH₁-103.85 kJ/mol AH₂ = -393.5 kJ/mol AH3 = -285.8 kJ/mol AH