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Unformatted text preview: ChEn 2001, Homework #2 Due Wednesday, September 16, 2009 Problem 1 (Murphy 1.17). Carbon nanotubes have been proposed as a novel way to store hydrogen safely and compactly in a solid form at room temperature and pressure. Several re- searchers have reported synthesizing nanotubes containing 1% to 8% by weight of hydrogen. One group claimed that certain graphite nanofibers can store hydrogen at levels exceeding 50%, but others were skeptical. What is the wt% of hydrogen in common liquids and solids such as ethanol, methane, water and glucose? Use the results of your calculations to evaluate the importance and validity of the claims regarding the hydrogen storage potential of nanotubes. Problem 2 (Murphy 1.24. High-purity silicon for semiconductor manufacture is made from cheap ingredients — sand (SiO 2 ) and coke ( C ). The unbalanced chemical reaction is SiO 2 + C → Si + CO The silicon produced by this reaction is pure enough for making silicone-based polymers and for mixing with metals like aluminium, but it is not pure enough for electronics applications. For thosemixing with metals like aluminium, but it is not pure enough for electronics applications....
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This note was uploaded on 10/30/2011 for the course CHEN 2001 taught by Professor Dorfman during the Fall '08 term at Minnesota.
- Fall '08