hmwk3additional - Chemistry 2090 Your name here Stable...

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Chemistry 2090 Stable Isotopes? Your name here: September 12, 2008 In natural abundance, 98.9% of all C atoms are the isotope 12 C, and the remainder, 1.1%, are the isotope 13 C. Assume, contrary to fact, that these atoms are randomly distributed throughout all of the carbon-containing compounds on earth. 1. You are given a collection of molecules of carbon dioxide, CO 2 . What percent of them contain exactly 1 13 C atom? 2. The carbon dioxide is used to make a new molecule, a sugar, which is subsequently fermented to form ethanol with chemical formula C 2 H 6 O. What fraction of the ethanol molecules contain exactly 1 13 C atom, and what fraction contain 2 13 C atoms? 3. The heavy isotope of hydrogen, 2 H, appears with natural abundance 0.015%; that is, if you are given 100,000 hydrogen atoms, 15 of them will correspond to the heavy isotope; similarly, the abundances of the various oxygen isotopes are:
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