F05L10_6

# F05L10_6 - 2 Pr Ex 3.9 p 94 Calculate the molar mass of...

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2. Pr. Ex. 3.9 p 94: Calculate the molar mass of Ca(NO 3 ) 2 . C. Interconverting Masses, Moles, and Numbers of Particles 1. Masses to Moles Pr. Ex. 3.10 p 94 How many moles of NaHCO 3 are present in 508 g of this substance? 2. Moles to Masses Pr. Ex. 3.11 p 94 What is the mass, in grams, of (a) 6.33 mol of NaHCO 3 ? 3. Masses to Particles Pr. Ex. 3.12 p 96 (a) How many nitric acid molecules are in 4.20 g of HNO 3 ? (b) How many O atoms are in this sample? X 4.20 g HNO 3 X 6.022 x 10 23 molecules 1 mol = 4.01 x 10 22 molecules HNO 3 1 mol HNO 3 63.02 g HNO 3 = 1.20 x 10 23 atoms "O" 3 atoms "O" 1 molecule HNO 3 4.01 x 10 22 molecules HNO 3 X Like (a) How many moles of chloride ions are in 3.33- 0.0750 g of magnesium chloride? 3.36 (b) What is the mass, in grams, of 3.50 x 10 -3 mol of aluminum sulfate? 3.37 continued (c) What is the mass, in grams, of 1.75 x 10 20 molecules of caffeine, C 8 H 10 N 4 O 2 ? (d) What is the molar mass of cholesterol if 0.00105 mol weighs 0.406 g? V. Empirical Formulas from Analyses A. Empirical Formula – may be determined from the mass of each atom in a given compound 1. Like Pr. Ex. 3.14 p 98 A 5.325 g sample of methyl benzoate, a

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## This note was uploaded on 03/12/2010 for the course CHEM 140 taught by Professor Ferrence during the Fall '08 term at Illinois State.

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F05L10_6 - 2 Pr Ex 3.9 p 94 Calculate the molar mass of...

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