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March 6, 2012. AGENDA: 1 – Bell Ringer & Part. Log 2 – Intro: Weekly Raffle! 3 – Review Homework 4 – CN: The Mole and Molar Mass. Today’s Goal: Students will be able to calculate molar mass. Homework Calculating Molar Mass Friday is the Last Day to turn in Last Week’s Work.
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March 6, 2012 AGENDA: 1 – Bell Ringer & Part. Log 2 – Intro: Weekly Raffle! 3 – Review Homework 4 – CN: The Mole and Molar Mass Today’s Goal: Students will be able to calculate molar mass. Homework • Calculating Molar Mass • Friday is the Last Day to turn in Last Week’s Work
Cornell Notes • Topic: The Mole and Molar Mass • Date: 3/6/2012 • A mole is a quantity used to measure the amount of matter present. • Like a dozen = 12 • A mole = 6.02 x 1023 • A dozen doughnuts = 12 doughnuts • A mole of carbon = 6.02 x 1023 atoms (particles) of C What is the mole and how is it defined?
Cornell Notes (continued) What is molar mass? • Since the mole is always the same number, a mole of different elements or compounds will have different masses. • The mass of 1 mole was defined by Carbon-12. • 1 mole of carbon = 12 g 1 mol • 6.02 x 1023 atoms carbon = 12 g
Cornell Notes (continued) How do you calculate molar mass? • Determine types of atoms in a compound. • Find their atomic masses. • Sum all masses! Units = g / mol
Practice Problems (Left Side) 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)