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Mole Calculation with Avogadro's Number: Science Guide

Explore conversions between moles, particles, and mass using Avogadro's number in this informative guide about the mole concept and molar mass calculations.

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Mole Calculation with Avogadro's Number: Science Guide

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  1. Convert 3 miles into inches (5280 ft = 1 mile) • How many donuts are in 6.7 dozen donuts? Use dimensional analysis. • If one ream of paper is 500 sheets, how many sheets are in 3.4 reams of paper. Daily science (pg 72)

  2. The Mole Pg. 71

  3. A way to group atoms together • 12 is to a dozen as 6.02 x 1023 is to a mole • Avogardo’s number = 6.0221367 x 1023 • Based off of number of carbon atoms in 12 g of carbon -12 • 602000000000000000000000 atoms in one mole • Can be used to count: molecules, atoms, compounds Definition of a Mole

  4. Can write a conversion factor using Avogadro’s number to convert from moles to particles or particles to moles • Moles to particles: x 6.02 x 1023 1 mol • Particles to moles: x 1 mol 6.02 x 1023 Converting moles

  5. Determine the number of atoms in 2.50 moles of Zn • Calculate the number of molecules of H2O in 11.5 moles. • How many moles is 5.75 x 1024 atoms of Al? • How many moles is in 3.58 x 1023 units of ZnCl2 Examples

  6. Moles of different substances have different masses • Called molar mass (mass in grams of one mole of a substance) • Units: g/mol Mass and the Mole

  7. What is the molar mass of Silicon? • What is the molar mass of Cl2? • What is the molar mass of H2O Examples

  8. To find the mass of a certain amount of a substance, use a conversion factor for molar mass • Mass to moles: x 1 mole molar mass • Moles to mass: x molar mass 1 mole Conversions using molar mass

  9. How many moles are in the following: • 25.5 g of Ag • 300.0 g S • What is the mass of the following amount of moles: • 3.45 mol of Co • 42.6 mol Si Examples

  10. Multi step problem • Combine both conversion factors • Mass to atoms: x1 mol x 6.02 x 1023 atom molar mass 1 mol • Atoms to mass: x 1 mol x molar mass 6.02 x 10231 mol Conversions from mass to atoms and atoms to mass

  11. Convert 3.40 x 1022 atoms of He into grams • Convert 1.00 x 1024 molecules of MgO into grams • Convert 55.2 g Li into atoms Examples

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