1 / 22

Formulae

Formulae. Chemical, Empirical, and Molecular Formula Oh My!. chemical Formulae. A way of expressing the number of atoms of a compound Write the chemical formula of the following: Sodium chloride ____________ Lithium oxide ____________ Iron (II) bromide ____________

lorenzov
Télécharger la présentation

Formulae

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Formulae Chemical, Empirical, and Molecular Formula Oh My!

  2. chemical Formulae • A way of expressing the number of atoms of a compound • Write the chemical formula of the following: • Sodium chloride ____________ • Lithium oxide ____________ • Iron (II) bromide ____________ • Ammonium sulphide ____________

  3. chemical Formulae • A way of expressing the number of atoms of a compound • Write the chemical formula of the following: • Sodium chloride NaCl • Lithium oxide Li2O • Iron (II) bromide FeBr2 • Ammonium sulphide (NH4)2S

  4. Types of chemical Formulae • Molecular Formula • Identifies the number of each type of atom • Example: Hexane: C6H14 • Empirical Formula • Simplest whole number ratio of atoms of each element • Example: Hexane: C3H7 • Structural Formula • Shows the structure of the molecule

  5. Find the empirical formula

  6. Find the empirical formula

  7. Find the Molecular and Empirical Formula’s

  8. Example 1: • A sample of compound contains 5.723 g Ag, 0.852 g S, and 1.695 g O. Determine its empirical formula.

  9. Example 1: • A sample of compound contains 5.723 g Ag, 0.852 g S, and 1.695 g O. Determine its empirical formula.

  10. Example 1: • A sample of compound contains 5.723 g Ag, 0.852 g S, and 1.695 g O. Determine its empirical formula.

  11. Example 1: • A sample of compound contains 5.723 g Ag, 0.852 g S, and 1.695 g O. Determine its empirical formula.

  12. Example 1: • A sample of compound contains 5.723 g Ag, 0.852 g S, and 1.695 g O. Determine its empirical formula. Ans: Ag2SO4

  13. Example 2: • A sample of compound contains 18.7% Li, 16.3% C and 65.0% O by mass. Determine its empirical formula.

  14. Example 2: • A sample of compound contains 18.7% Li, 16.3% C and 65.0% O by mass. Determine its empirical formula. • Ans: Li2CO3

  15. Molecular Formula • To find the Molecular Formula we use the following relationship • Where Molar Mass is the mass of the Molecular Formula • Where N = the whole number multiple by which the empirical mass is increased

  16. Example 3: • A compound has an empirical formula of NH2 and a molar mass of 32.1 g/mol. • List 3 possible molecular formulae. • What is the compound’s molecular formula?

  17. Example 3: • A compound has an empirical formula of NH2 and a molar mass of 32.1 g/mol. • List 3 possible molecular formulae. • NH2, N2H4, N3H6 • What is the compound’s molecular formula? • N2H4

  18. Example 4: • A compound containing 40.0% carbon, 6.7% hydrogen and 53.3% oxygen has an molar mass of 180.2 g/mol. What is the molecular formula?

  19. Example 4: • A compound containing 40.0% carbon, 6.7% hydrogen and 53.3% oxygen has an molar mass of 180.2 g/mol. What is the molecular formula?

  20. Example 4: • A compound containing 40.0% carbon, 6.7% hydrogen and 53.3% oxygen has an molar mass of 180.2 g/mol. What is the molecular formula?

  21. Example 4: • A compound containing 40.0% carbon, 6.7% hydrogen and 53.3% oxygen has an molar mass of 180.2 g/mol. What is the molecular formula? • Molecular Formula: C6H12O6

  22. In-Class Work • Download and complete the Empirical and Molecular worksheet from my Website • AND… • Hebden Questions: p. 91-95 Q’s 46 a,b,c,m,n 47-52 and 54

More Related