Unformatted text preview: Chemistry 2090 Homework #11 Please hand in answers to the following questions found in Chapter 6 of Petrucci et al at the beginning of class on Monday, November 24. Questions 14, 16, 32, 36, 40, 48 and 64. In addition, please answer the following questions: 1. In a chemical reaction it is repeatedly found that the limiting reagent is the LiCl; i.e. that there are fewer LiCl molecules in reaction vessel than thought. A student is asked to solve the mystery of why the LiCl seems to be missing. He suspects an impurity in the reactant, and sends the salt to be analyzed by mass spec. (a) To his surprise, there are no obvious impurities in the sample. But the ratio of 6 Li to 7 Li atoms is surprising; he finds that the abundance of 6 Li is only 2.3% of the total. What is the average mass of the Li atoms in his sample? (b) The reaction is designed to consume N moles of Li based on the atomic weight of Li provided in the periodic table. In practice, how many moles of Li are consumed before the reaction can no longer continue?consumed before the reaction can no longer continue?...
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This note was uploaded on 03/27/2009 for the course CHEM 2090 taught by Professor Zax,d during the Fall '07 term at Cornell.
- Fall '07