Chemistry 2090Stable Isotopes?Your name here:September 12, 2008In natural abundance, 98.9% of all C atoms are the isotope12C, and the remainder, 1.1%, are theisotope13C. Assume, contrary to fact, that these atoms are randomly distributed throughout all of thecarbon-containing compounds on earth.1. You are given a collection of molecules of carbon dioxide, CO2. What percent of them containexactly 113C atom?2. The carbon dioxide is used to make a new molecule, a sugar, which is subsequently fermentedto form ethanol with chemical formula C2H6O. What fraction of the ethanol molecules containexactly 113C atom, and what fraction contain 213C atoms?3. The heavy isotope of hydrogen,2H, appears with natural abundance 0.015%; that is, if you aregiven 100,000 hydrogen atoms, 15 of them will correspond to the heavy isotope; similarly, the
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This note was uploaded on 02/17/2009 for the course CHEM 2090 taught by Professor Zax,d during the Fall '07 term at Cornell.