Chem 287 _Chapter 1

Chem 287 _Chapter 1 - 287 Chapter 1 Chemical Measurements...

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1 287 Chemistry Salin Chapter 1 Page 1 287 Chapter 1 Chemical Measurements Topics: Units and conversions Chemical Concentrations Equilibrium Constants Le Chatelier’s Principle 2
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3 287 Chemistry Salin Chapter 1 Page 5 Conversion Factors “same” units 1 kPa/(10 3 (Pa)) is a conversion factor = 1 So to convert 1.3 * 10 4 Pa 1.3 * 10 4 Pa * [1 kPa/(10 3 Pa)] = 1.3 * 10 1 kPa = 13 kPa 287 Chemistry Salin Chapter 1 Page 6 Conversion Factors (between units) a conversion factor = 1 (6.24 * 10 18 electrons/C) electrons to Coulombs Example: ( 37 * 10 -15 C) * (6.24 * 10 18 electrons/C) = 2.3 * 10 5 electrons
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4 287 Chemistry Salin Chapter 1 Page 7 Expression of Concentration Molarity (moles/volume) moles/liter = mol/L Typical calculation: 2.7 g of NaCl in 1.0 dl…mol/L? NaCl : 22.99 g/mol+35.45 g/mol = 58.44 g/mol 2.7 g/58.44 g/mol = 0.046 mol .046 mol/0.1 L =0.46 mol/L Be careful with the units! Meticulous” Note the term “Formal” (F)…sometimes a more correct term if species are not dissociated.
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This note was uploaded on 07/15/2011 for the course CHEM 287 taught by Professor Burns during the Fall '08 term at McGill.

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Chem 287 _Chapter 1 - 287 Chapter 1 Chemical Measurements...

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