CHEM 251 1st Edition Lecture 18 Outline of Last Lecture I. Clicker QuestionII. Reaction ChemistryIII. Thermochemical CyclesOutline of Current Lecture IV. Clicker QuestionsV. Solar FuelsVI. The Fisher-Tropsch ProcessVII. Future Synthetic FuelsCurrent LectureVIII. Clicker Questionsa. Calculate ΔHrxn for the following 2-step reaction: Answer: -904 kJ/molIX. Solar Fuelsa. Synthetic fuel produced using solar energyb. Why fuels? Energy densityc. Choosing fuelsi. Combust cleanly to release lots of energyii. Highly exergoniciii. To synthetize fuel, need uphill reactioniv. Endergonic reactions rare but store energyv. CO2 emitted from combustion is recollected and turned back into fuel = “carbon neutral” cycle w/ net zero emissionsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.vi.X. The Fisher-Tropsch Processa. Favorable overall but high energy intermediateb. Path does matter – expensive to steam reform methanec. Not carbon neutral XI. Future Synthetic Fuelsa. Requires abundant sustainable starting materialsb. High energy productsc. Harnessing solar energy to drive uphill reactionsd. Acid Splittingi. What is ΔHrxn for the following reaction: ii.iii. Answer: (-2)(-167) = 334 kJ/moliv. In the reverse reaction, H2 is the
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