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Chemistry Unit 7 – The Mole

Chemistry Unit 7 – The Mole. Lesson 2 – Molecular Molar Mass Book Section: 10.2 Objective: SWBAT determine molar masses of molecules. Agenda: Lesson, Practice, Video, HW You need calculators today!. Molecular Molar Mass.

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Chemistry Unit 7 – The Mole

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  1. ChemistryUnit 7 – The Mole Lesson 2 – Molecular Molar Mass Book Section: 10.2 Objective: SWBAT determine molar masses of molecules. Agenda: Lesson, Practice, Video, HW You need calculators today!

  2. Molecular Molar Mass • Just like we can find the molar mass of an element, we can find the molar mass of a compound. • What is the molar mass of hydrogen? • 1.00794 g/mol • Units of grams per mole • What is the molar mass of oxygen? • 15.9994 g/mol • In this class, it is acceptable to round molar masses to the tenths place.

  3. Molecular Molar Mass • Now, to find the molar mass of H2O. • Every mole of H2O has… • 2 mol of H • 1 mol of O • The molar mass of a compound is the sum of the molar masses of its elements. • MM H2O = 2(MM H) + 1(MM O) • MM H2O = 2(1.0 g/mol) + 1(16.0 g/mol) • MM H2O = 18.0 g/mol • 18 grams of water = 1 mol water = 6.02 x 1023 molecules of water

  4. Practice - Easy • What is the molar mass of carbon dioxide, CO2?

  5. Practice - Easy • What is the molar mass of carbon dioxide, CO2? • 44.0 g/mol

  6. Practice - Medium • What is the molar mass of barium sulfate, BaSO4?

  7. Practice - Medium • What is the molar mass of barium sulfate, BaSO4? • 233.4 g/mol • Neat Website: http://www.webqc.org/mmcalc.php • Can use to check your work!

  8. Practice - Hard • What is the molar mass of sodium carbonate?

  9. Practice - Hard • What is the molar mass of sodium carbonate? • 106 g/mol (Na2CO3)

  10. HW 7-2 Due Monday • Next Week: • Monday: Molar Mass Calculations (10.2) • Tuesday: The Mole Lab • Wednesday: Percent Composition (10.3) • Thursday: Empirical Formulas (10.4) • Friday: Empirical Formula Lab

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