1. Chapter 3 Chemical Quantities (The Mole)

2. The Mole 1 dozen = 1 gross = 1 ream = 1 mole = 12 144 500 6.02 x 10 23 1 mole Carbon = 12.01 g Carbon 6 C 12.01 1 mole Carbon = 6.02 x 10 23 atoms C Molar Mass

3. The mass in grams of 1 mole of a substance. 1 H 1.01 1 mole H = 1.01 g H

4. Calculating Molar Mass Ammonium Chloride + 35.45 g = 53.50 g NH 4 Cl 14.01 g x 1 1.01 g x 4 14.01 g + 4.04 g 35.45 g x 1 7 N 14.01 1 H 1.01 17 Cl 35.45

5. Calculating Molar Mass Aluminum nitrate + 48.00 g) = = 213.01 g Al(NO 3 ) 3 26.98 g x 1 14.01 g x 1 26.98 g (14.01 g 16.00 g x 3 62.01 26.98 g+ 186.03 13 Al 26.98 7 N 14.01 8 O 16.00

6. Alternate method Aluminum nitrate + 144.00 g =213.01 g Al(NO 3 ) 3 26.98 g x 1 14.01 g x 3 26.98 g+ 42.03 g 16.00 g x 9 13 Al 26.98 7 N 14.01 8 O 16.00

7. 20 Ca 40.08 8 O 16.00 1 H 1.01 Calculating Molar Mass Calcium hydroxide = 74.1 g = 74.10 g Ca(OH) 40.08 g x 1 16.00 g 40.08 g + 1.01 g x 2 17.01 40.08 g+ 34.02 2

8. 12 Mg 24.31 15 P 30.97 8 O 16.00 Calculating Molar Mass Magnesium phosphate + 64.00 g) = = 262.87 g Mg 3 (PO 4 ) 2 24.31 g x 3 30.97 g x 1 72.93 g (30.97 g 16.00 g x 4 x 2 94.97 72.93 g+ 189.94

9. 12 Mg 24.31 15 P 30.97 8 O 16.00 Calculating Molar Mass Magnesium phosphate + 128.00 g =262.87 g Mg 3 (PO 4 ) 2 24.31 g x 3 30.97 g x 2 72.93 g+ 61.94 g 16.00 g x 8

10. Calculating Molar Mass Dinitrogen tetroxide 92.02 g N2O4N2O4N2O4N2O4 14.01 g x 2 16.00 g x 4 28.02 g+ 64.00 g = 7 N 14.01 8 O 16.00

11. Calculating Molar Mass Phosphorus pentachloride 208.22 g PCl 5 30.97 g x 1 35.45 g x 5 30.97 g+ 177.25 g = 15 P 30.97 17 Cl 35.45

12. Calculating Molar Mass Nitrogen monoxide = 30.01 g NO 14.01 g+ 16.00 g 7 N 14.01 8 O 16.00

13. Calculating Molar Mass Carbon tetrachloride 153.81 g CCl 4 12.01 g x 1 35.45 g x 4 12.01 g+ 141.80 g = 6 C 12.01 17 Cl 35.45

14. Molar Mass Molar Mass = Mass of 1 mole. Type of compoundUnitsMeaning Ionic Compound (Cation + anion) (metal w/ nonmetals) gfmgram formula mass Molecular Compounds (nonmetal groupings) gmmgram molecular mass Atoms (elements by themselves) gamgram atomic mass Molar Mass (general meaning) g/molgrams/mole