Mass Mole INterconverstions

# Mass Mole INterconverstions - Mass Mole Interconversion. A....

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Mass Mole Interconversion. A. Introduction. ................................................................................................... 1 B. Mass mole interconversions: simple. ........................................................ 1 C. Mass mole interconversions: complex . .................................................... 2 D. Answers . ........................................................................................................ 3 A. Introduction This handout should be done after completing Molar Mass and Dimensional Analysis, especially Part D. (You will also need to use some metric prefixes and exponential notation. These topics are covered in optional handouts.) It must be done before Molarity. There is a quiz after each of the major sections. The quiz after Sect B is optional. (The idea is to give you flexibility. If you prefer to do one small piece at a time, this quiz is a useful checkpoint. On the other hand, if you are comfortable “whizzing by” this one, that’s ok, too.) B. Mass mole interconversions: simple An easy way to measure the amount of a chemical is to weigh it (measure the mass). However, chemists are often interested in knowing the amount of a chemical in moles; balanced chemical equations tell the amount of each chemical involved in a reaction -- in moles. It is important to be able to convert between the practical measurement (mass) and the underlying relevant measurement (moles). You know how to calculate the molar mass (formula weight) of a chemical. You also know how to apply the method of dimensional analysis to guide you through problems involving unit conversions. Since the units of the molar mass are g/mole, mass mole interconversion problems are a simple application of dimensional analysis. Examples B1. How many grams are in 2.00 moles of NaCl? 2.00 mol 58.44 g x  = 117 g mol B2. How many moles are in 117 g of NaCl? 117 g mol x  = 2.00 mol 58.44 g

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Mass Mole Interconversion. Page 2 How many decimal places. Revisited. We discussed this briefly in Molar Mass. At that point, the main advice was to try to be consistent. There is nothing inherent in the molar mass calculation alone to suggest any particular calculation precision. But now we have some guidance. In mass mole interconversions you are given one piece of data and asked to calculate something from it. Data is an experimental measurement (actual or implied), and
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## This note was uploaded on 03/14/2011 for the course CHEM 237 taught by Professor Andersen during the Spring '08 term at University of Washington.

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Mass Mole INterconverstions - Mass Mole Interconversion. A....

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