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Chap 2 Sec 1-6

# Chap 2 Sec 1-6 - Chapter 2 2.1 Elements Compounds Mixtures...

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Chap 2 Sec 1-6sm.doc 9/09 Page 1 Chapter 2 2.1 Elements, Compounds, & Mixtures - 2.2 Observations That Led to an Atomic View of Matter Mass Conservation Total weight of reactants -----> Definite Composition: Each compound has a specific weight ratio of elements Example problem. How we can use this information and the weight ratios. Similar to follow-up 2.2. We know: 1.27 g of galena (a compound of lead & sulfur) contains 1.10 g of Pb and the rest is S. a) How many grams of sulfur are in the compound? 1.27 g galena –1.10 g Pb b) What is the mass fraction of Pb and S? and c) What is the mass % of Pb and S? Lead: mass fraction part whole = 1.10 g Pb 1.27 g galena = 0.866 1 mass % = part whole ( mass fraction) x 100% 0.866 1 mass fraction x 100% =

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Chap 2 Sec 1-6sm.doc 9/09 Page 2 Sulfur: 0.17 g S 1.27 g galena = 0.13 385 = 0.13 4 mass fraction x 100% = d) ? lb of Pb from 15.0 lb of galena = The information came from part a of this example. 12.99 -----> or 15.0 lb of galena x = This information came from part b & c of this example.
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Chap 2 Sec 1-6 - Chapter 2 2.1 Elements Compounds Mixtures...

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