Chapter 3 Chemical Quantities (The Mole)

The Mole 1 dozen = 1 gross = 1 ream = 1 mole = x mole Carbon = g Carbon 6 C mole Carbon = 6.02 x atoms C Molar Mass

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

Calculating Molar Mass Ammonium Chloride g = g NH 4 Cl g x g x g g g x 1 7 N H Cl 35.45

Calculating Molar Mass Aluminum nitrate g) = = g Al(NO 3 ) g x g x g (14.01 g g x g Al N O 16.00

Alternate method Aluminum nitrate g = g Al(NO 3 ) g x g x g g g x 9 13 Al N O 16.00

20 Ca O H 1.01 Calculating Molar Mass Calcium hydroxide = 74.1 g = g Ca(OH) g x g g g x g

12 Mg P O Calculating Molar Mass Magnesium phosphate g) = = g Mg 3 (PO 4 ) g x g x g (30.97 g g x 4 x g

12 Mg P O Calculating Molar Mass Magnesium phosphate g = g Mg 3 (PO 4 ) g x g x g g g x 8

Calculating Molar Mass Dinitrogen tetroxide g N2O4N2O4N2O4N2O g x g x g g = 7 N O 16.00

Calculating Molar Mass Phosphorus pentachloride g PCl g x g x g g = 15 P Cl 35.45

Calculating Molar Mass Nitrogen monoxide = g NO g g 7 N O 16.00

Calculating Molar Mass Carbon tetrachloride g CCl g x g x g g = 6 C Cl 35.45

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