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March 7, 2012

March 7, 2012. AGENDA: 1 – Bell Ringer & Part. Log 2 – Review Homework 3 – CN: Mole to Grams Conversion 4 – Weekly Raffle! 5 – Work Time. Today’s Goal: Students will be able to convert from moles to grams. Homework Mole and Mass Conversions: Page 1 (Moles  Grams)

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March 7, 2012

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  1. March 7, 2012 AGENDA: 1 – Bell Ringer & Part. Log 2 – Review Homework 3 – CN: Mole to Grams Conversion 4 – Weekly Raffle! 5 – Work Time Today’s Goal: Students will be able to convert from moles to grams. Homework • Mole and Mass Conversions: Page 1 (Moles  Grams) • Friday is the Last Day to turn in Last Week’s Work

  2. Review From Yesterday’s Notes:Practice Problems (Left Side of NB) NaCl = Na = Cl = 58.5 g 1 mol Ag = 107.9 g 1 mol LiNO3 = Li = N = 3 x O = 68.9 g 1 mol 23.0 6.9 35.5 14.0 + + (3x16.0)

  3. Cornell Notes • Topic: Mole to Grams Conversion • Date: 3/7/2012 • Remember: Molar Mass is the mass of 1 mole of any substance. • 1 mole (mol) always = 6.02 x 1023 particles • So 1 mol of different substances will have different masses.

  4. Cornell Notes (continued) • Imagine if you want to measure out a 1.5 mole sample of silver metal…? • Could you count out 1.5 moles? • But you can use molar mass to convert moles to grams, and you can measure grams. Molar Mass of Silver = 1.5 mole ... NO! • 107.87 g Ag • 1 mole Ag • x107.87 g= • 1 mole 1.5 x 107.87 g = 161.8 g Ag

  5. Cornell Notes (continued) • If you had a 7.5 mole sample of H2O, how many grams would you have? • Determine the molar mass. • Convert! (Watch units!) 1. H2O = 2xH = O = 18.0 g 1 mol 2. 7.5 mole H2O x 18.0 g 1 mol = 7.5 x 18.0 g H2O = 135.0 g H2O (2 x 1.0) 16.0 +

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