1 / 5

Chapter 10: Chemical Quantities Mole-Mass Relationships

Chapter 10: Chemical Quantities Mole-Mass Relationships. Mrs. Mansberger. Converting Mass to Moles. Use the molar mass of an element or compound to convert between mass and moles of that substance. Known 92.2 g Fe 2 O 3. Unknown ? mol Fe 2 O 3. 92.2 g Fe 2 O 3. Calculate Molar Mass.

luisad
Télécharger la présentation

Chapter 10: Chemical Quantities Mole-Mass 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. Chapter 10: Chemical QuantitiesMole-Mass Relationships Mrs. Mansberger

  2. Converting Mass to Moles • Use the molar mass of an element or compound to convert between mass and moles of that substance Known 92.2 g Fe2O3 Unknown ? mol Fe2O3 92.2 g Fe2O3 Calculate Molar Mass Fe = 55.8 g O = 16.0 g X 2 • 159.6 g Fe2O3 = 1 mol Fe2O3 = 111.6 g X 3 = 48.0 g + 159.6 g 1 mol Fe2O3 = 159.6 g Fe2O3 0.577694 mol Fe2O3 = 0.578 mol Fe2O3

  3. Try this with your partner… • Calculate the number of moles in 75.0 g of magnesium fluoride. Known 75.0 g MgF2 Unknown ? mol MgF2 Calculate Molar Mass Mg = 24.3 g F = 19.0 g X 1 • 62.3 g MgF2 = 1 mol MgF2 = 24.3 g X 2 = 38.0 g + 62.3 g 1 mol MgF2 75.0 g MgF2 = 1.20385 mol MgF2 62.3 g MgF2 = 1.20 mol MgF2

  4. Mole – Mass Relationships Converting Moles to Mass Known 9.45 mol Al2O3 Unknown ? g Al2O3 Calculate Molar Mass First Al = 27.0 g O = 16.0 g X 2 = 54.0 g • 102.0 g Al2O3 = 1 mol Al2O3 X 3 = 48.0 g + 102.0 g 102.0 g Al2O3 9.45 mol Al2O3 = 963.9 g Al2O3 1 mol Al2O3 = 964 g Al2O3

  5. Try this with your partner… Known 0.452 mol C20H42 Unknown ? g C20H42 Calculate Molar Mass C = 12.0 g H = 1.0 g X 20 • 282.0 g C20H42 = 1 mol C20H42 = 240.0 g X 42 = 42.0 g + 282.0 g 282.0 g C20H42 0.452 mol C20H42 = 1 mol C20H42 127.464 g C20H42 = 127 g C20H42

More Related