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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.

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Chapter 10: Chemical Quantities Mole-Mass Relationships

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  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

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