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Section 3 Moles of Compounds

Section 3 Moles of Compounds. Objectives: Recognize the mole relationship shown by chemical formula Calculate the molar mass of a compound Calculate the number of moles of a compound from a given mass of the compound Determine the number of atoms or ions present in a mass of a compound.

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Section 3 Moles of Compounds

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  1. Section 3 Moles of Compounds Objectives: Recognize the mole relationship shown by chemical formula Calculate the molar mass of a compound Calculate the number of moles of a compound from a given mass of the compound Determine the number of atoms or ions present in a mass of a compound

  2. Review of Chemical Formulas • Indicates types & numbers of atoms contained in 1 unit of compound • Freon is CCl2F2 • 1 atom of carbon • 2 atoms of chlorine • 2 atoms of fluorine

  3. Chemical Formulas • Indicate number of moles of each element in 1 mole of the compound • 1 mol of CCl2F2 has: • 1mol C atom • 2 mol Cl atoms • 2 mol F atoms

  4. Sample Problem • How many moles of F atoms are in 5.5 mol of freon? 5.5 mol CCl2F2 x 2 mol F atoms = 11 mol F 1 mol CCl2F2

  5. Sample Problem 2 • Determine the moles of aluminum ions (Al 3+ ) in 1.25 moles of Al2O3.

  6. Molar Mass of a Compound • What is it for an element? g/mol Determined by adding up masses of each element in compound

  7. Example • Find the molar mass of potassium chromate.

  8. Mole To Mass Conversion • What is the mass of 2.50 moles of allyl sulfide, (C5H5)2S? • Find molar mass of compound to use as conversion factor Moles x Molar Mass (g/mol) = Mass in grams

  9. Mass to Moles Conversion • Calculate the number of moles of calcium hydroxide in 325g. • Find molar mass of compound to use as conversion factor Grams x Molar Mass (mol/g) = Moles

  10. Sample Problem • A sample of aluminum chloride (AlCl3) has a mass of 35.6g. • How many aluminum ions are present? • How many chloride ions are present?

  11. Homework • Section 11.3 Problems 15-24 on pages 876-877

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