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# Point Group Symmetry of a Coordination Complex

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##### Solution Summary

This solution comprehensively discusses the background and rationale behind the problem with the help of some diagrams and gradually arrives to the answers.

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In general, for this kind of problem first you have to look at the molecular geometry. Then you have to apply all sorts of symmetry operations to identify the point group. A great deal of visualization is involved in the process.

(a)

allyl tricarbonyl cobalt complex

[See pages 69-70 of the book titled "Molecular Symmetry" by David Willock in google books. It gives a general guideline and flow diagram on how to assign point groups. Also the attached lecture notes show how to determine proper rotation axis, mirror plane, center of symmetry ...

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• "Thankyou for the feedback. I have a few question though; With the first statistic about cost below... “According to Sigma-Aldrich catalog, cost of 1L octane is AUD \$ 392.00, whereas the cost of 1L ethanol is AUD \$196.00. Moreover, if ethanol is obtained from sugar industry as a by-product, it may cost even less. Source of oxygen is ambient atmosphere, so it costs nothing. So ethanol is much cheaper than petrol, in fact it is half-priced: AUD \$ (392-196) = \$ 196.” I didn't think it made sense because the cost of petrol per litre is normally a dollar something or even less than a dollar not a couple of hundred of dollars. For example, a statistic that I found in america was: "U.S. ethanol production costs are about \$1.20 per gallon of ethanol, or \$1.82 per gallon on a gasoline-equivalent basis." However, I was wondering whether you could find an Australian statistic. Also, you mentioned that H20 is not a greenhouse gas. However, in the combustion equations it is actually carbon dioxide and water vapour which are produced and they are both greenhouse gases. Finally, how do I calculate the energy efficiency of ethanol and petrol? "
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