1 / 18

Lesson 2: The Molar Relationships

Lesson 2: The Molar Relationships. Unit 8 – Moles and Stoichiometry. Molar Relationships. We can convert between moles, N A , molar mass and volume using molar relationships and dimensional analysis . Relationships: grams and moles grams and representative particles

lexi
Download Presentation

Lesson 2: The Molar Relationships

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. Lesson 2:The Molar Relationships Unit 8 – Moles and Stoichiometry

  2. Molar Relationships • We can convert between moles, NA, molar mass and volume using molar relationships and dimensional analysis. • Relationships: grams and moles grams and representative particles moles and representative particles moles and liters

  3. Molar ConversionsGrams and Moles molar mass Mass in Grams Moles (g/mol)

  4. Converting Moles to Grams How many grams of lithium are in 3.50 moles of lithium? 3.50 mol Li 1 6.94 g Li = g Li 24.29 1 mol Li

  5. Converting grams to moles How many moles of lithium are in 18.2 grams of lithium? 18.2 g Li 1 1 mol Li = mol Li 2.62 6.94 g Li

  6. Converting Moles to Mass in a Compound • How many grams of calcium chloride are in 0.98moles of calcium chloride? .98mole CaCl2 110.98g CaCl2 1mole CaCl2 = 108.76 g CaCl2 1

  7. MASS IN GRAMS MOLES NUMBER OF PARTICLES Molar RelationshipGrams and Representative Particles molar mass 6.02  1023 (g/mol) (particles/mol)

  8. Molecules to Grams • Find the mass of 2.1  1024 molecules of NaHCO3. 1 mol NaHCO3. 6.02  1023 molecules 2.1  1024 Molecules 1 84.01 g 1 mol = 293.06 g NaHCO3 2.9x102

  9. Grams to Molecules • Find the number of molecules in 5 grams of MgSO4. 1 mol MgSO4 120.37g 5 grams MgSO4 1 6.02  1023 molecules 1 mol = 2.50  1022 molecules MgSO4

  10. Molar Volume of Gases Avogadro’s Law • equal volumes of gases at the same Temperature and Pressure contain equal numbers of molecules • at same T and P, volumes varies directly with number of moles (n)

  11. Molar Volume of Gases • like molar mass • mass of one mole of substance • but with volume • volume of one mole of substance • because of Avogadro’s law, one mole of any gas has the same volume as any other gas at the same T and P

  12. Molar Volume of Gases • Standard Temperature and Pressure • STP • 1 atm and 0°C • Standard Molar Volume of Gas • volume of one mole of gas at 1 atm and 0°C is 22.4L • 22.4 L of any gas has one mole of particles but has different masses

  13. Molar Volume of Gases

  14. Moles to Volume • A chemical reaction produces 0.0680 mol of oxygen gas. What volume in liters is occupied by this gas sample at STP? • 1 mol : 22.4 L

  15. Volume to Moles • A chemical reaction produced 98.0 mL of sulfur dioxide gas at STP. What was the mass of gas made?

  16. Molar Volume Problems • How many liters of Oxygen gas are in 5.0 moles Oxygen at STP? 5.0 mol 1 22.4L = 112.00L 1 mol

  17. Converting Between Mass, Amount, and Number of Particles

  18. Converting Grams to Moles • How many moles of carbon are in 26 g of carbon? 26 g C 1 1 mol C 12.01 g C = 2.2 mol C

More Related