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PROBLEMS 1. Calculate the heat produced for burning the following hydrocarbons. Assume one mole unless otherwise indicated. (a) Heptane C7H16 (b) Octane C8H18 (c) 2,2,3-trimethylpentane C8H18 2. How much heat could be gained from the burning of 250. grams (g) of 2,2,3-trimethylpentane? 3. Of the three substances mentioned above, which would be the better fuel and why? 4. EPA regulations require that gasoline in some regions of the country be oxygenated by adding f 10 percent by weight ethanol, C2H5OH . If the DH8 of ethanol is –56.2 kcal/mol and the gasoline is assumed to be 2,2,3-trimethylpentane, how much heat is given off by burning 250. g of this mixture? How does that compare to the answer in problem 2 for pure 2,2,3-trimethylpentane? 38 f DH8 = –44.9 kcal/mol f DH8 = –49.8 kcal/mol f DH8 = –52.6 kcal/mol Hess’s LawPDF Image | NASA Guide to Engines
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