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Chapter 10 Section 1

Chapter 10 Section 1. Molar Mass. Molar Mass. The mass of 1 mole of a pure substance (Ex) mass of 1 mole of C-12 = mass of 6.02x10 23 C-12 atoms B. Numerically the same as the average atomic mass unit ( amu ) (Ex) mass of 1 carbon atom = 12.01 amu molar mass of C = _______ g

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Chapter 10 Section 1

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  1. Chapter 10 Section 1 Molar Mass

  2. Molar Mass The mass of 1 mole of a pure substance (Ex) mass of 1 mole of C-12 = mass of 6.02x1023 C-12 atoms B. Numerically the same as the average atomic mass unit (amu) (Ex) mass of 1 carbon atom = 12.01 amu molar mass of C = _______ g C. molar mass of a compound = the sum of each atom’s mass (Ex) molar mass of H2O = ?

  3. Practice Find the molar mass of: 1) C6H5CH3 (toluene) 2) CaHPO4 3) Ca3(PO4)2 4) CrSO4∙3H2O

  4. Answers 1) 92.15 g 2) 136.1 g 3) 310.2 g

  5. In 1 mol of CO2, (1) how many CO2 molecules? (2) what is the molar mass of CO2? (3) how many C atom(s) in one CO2 molecule? (4) how many O atom(s) in one CO2 molecule?

  6. In 1 mol of Mg(NO3)2, • how many formula units of Mg(NO3)2? • what is the molar mass of Mg(NO3)2? • how many N atom(s) in one formula unit of Mg(NO3)2? • how many O atom(s) in one formula unit of Mg(NO3)2

  7. More Converting • Mol to mass? • Mass to mol? • Answer? • Use the conversion setup!!

  8. Practices 1) How many moles of Mg(NO3)2, are in 92.2 g of Mg(NO3)2?

  9. 2) What is the mass of 0.45 mol CO2?

  10. Learned So Far mol Avogadro’s # Molar mass # of particles (atoms, molecules, formula units, ions) mass

  11. Problem Solving Strategy • Know what are you solving for. • Know what is the given quantity to convert. • Know what is the conversion factor. • 1 mol = 6.02x1023 particles • 1 mol = mass of 1 mol of a substance

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