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01 Notes - Mole Conversions

01 Notes - Mole Conversions - Pluchino Regents Chemistry...

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Pluchino Regents Chemistry The Mole & Stoichiometry 01 Mole Conversions Aim: What is the mole and why is it important? Do Now: Look at the samples in the front of the room…what do they all have in common? Mole: the SI unit of quantity - also called Avogadro’s number. 6.02 x 10 23 Practice: Use the mole to convert units. 1. 3.11 moles of O 2 how many molecules? 2. 2.76 moles of FeS how many molecules? 3. 8.49 x 10 24 atoms of Cu how many moles? Molar Mass: the mass of one mole of a substance. Measured in g/mol. *Gram-formula mass or molecular weight 1 molecule of H 2 O: 1mole of H 2 O: 2H 2 x 1 amu 2H 2x1 g/mol 1O 1 x 16 amu 1O 1 x 16 g/mol 18 amu 18 g/mol Practice: Calculate the molar mass of each substance. 1. Fe 2 O 3 2. C 6 H 12 O 6 3. AlF 3 4. H 2 CrO 4 Molar mass enables us to convert between the mass of a sample and the number of moles in that sample! 100.0 g of NaCl how many moles? 100.0 g NaCl x 1 mol = 1.72 mol NaCl 58 g Practice: Convert using the mole.
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