1. Molar Mass! Chapter Ten Chemistry Mrs. Luckett

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3. Molar Mass  It equals how many grams are in one mole of an element or compound  Examples: Element: Na molar mass is 22.990 grams Compound: NO molar mass is 30 grams  Use the subscript numbers to get your total H 2 O = H is 1.0079 x 2 = 2.0158 O is 15.999 x 1 = 15.999 Molar mass =

4. Calculating molar mass with parentheses  When there are parentheses you have to multiply the subscript number on the outside by the subscript on the inside.  Example: Mg(NO 3 ) 2 Mg = 1 x 24.305 grams = 24.305 N = (2 x 1) x14 grams = 28 O = (3 x 2) x 16 grams = 96 Total = ____ grams

5. Practice Problems  What is the molar mass of the following compounds? 1) FeO 2) Li 3 PO 4 3) P(NO 2 ) 3

7. Single Step Conversions Luckett Chemistry

8. Conversion factors  You need to create two conversion factors for each equal quantity 1 moleORmolar mass molar mass1 mole 1 moleOR22.4 L 22.4 L1 mole 1 mole 6.02 x 10 23 particles 6.02 x 10 23 particles1 mole Example: what are the two conversion factors for the molar mass of LiNO 3 ?

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10. Converting moles to mass and mass to moles  To convert moles to mass you have to multiply by the molar mass _____ moles x molar mass 1 mole  To convert mass to moles you have to divide by the molar mass _____ grams x 1 mole molar mass

11. Practice Problems  Knowing the molar mass convert the following mole quantities to grams. 1) 0.98 moles FeO 2) 234 grams Li 3 PO 4 3) 7.56 moles P(NO 2 ) 3

12. Converting Particles to Moles and Moles to Particles  To convert moles to the number of particles you have to multiply by avogadro’s number _____ moles x 6.02 x 10 23 particles 1 mole  To convert the number of particles to moles you have to divide by avogadro’s number _____ particles x 1 mole 6.02 x 10 23 particles

13. Practice Problems Convert between moles and particles. 0.98 moles FeO 2.34 x 10 25 particles Li 3 PO 4 7.56 moles P(NO 2 ) 3

14. Converting Volume to Moles and Moles to Volume  To convert moles to volume you have to multiply by 22.4 L _____ moles x 22.4 L 1 mole  To convert volume to moles you have to divide by 22.4 L _____ Liters x 1 mole 22.4 L

15. Practice Problems 1) Convert the following mole quantities to Liters. 2) 0.98 moles FeO 3) 234 Liters Li 3 PO 4 4) 7.56 moles P(NO 2 ) 3