Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
9th Edition
ISBN: 9781133949640
Author: John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher: Cengage Learning
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Chapter 20, Problem 48SCQ

What is the likelihood that hydrogen (H2) will become a widely used fuel and that the “hydrogen economy” will become a reality? In particular, what are the advantages and disadvantages of H2 as a fuel? What would be necessary for a significant conversion to a “hydrogen economy”?

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Ethanol, C₂H6O, is most often blended with gasoline - usually as a 10 percent mix - to create a fuel called gasohol. Ethanol is a renewable resource and ethanol-blended fuels, like gasohol, appear to burn more efficiently in combustion engines. The combustion of one mole of ethanol releases 326.7 kcal of energy. The combustion of one mole of 2-methylhexane, C7H16, releases 1.150 × 10³ kcal of energy. How much energy is released during the complete combustion of 450. grams of 2-methylhexane? kcal Assuming the same efficiency, would 450. grams of ethanol provide more, less, or the same amount of energy as 450. grams of 2- methylhexane?

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Chemistry & Chemical Reactivity

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