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The Mole Road Map

The Mole Road Map. Chemistry Unit 6: Chemical Quantities Lecture 6.4. Objectives. Convert a quantity of a chemical between moles, mass (g), particles, and volume. ALL About the Mole…. We have now looked at the mole in terms of mass (g), particles, and volume.

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The Mole Road Map

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  1. The Mole Road Map Chemistry Unit 6: Chemical Quantities Lecture 6.4

  2. Objectives • Convert a quantity of a chemical between moles, mass (g), particles, and volume.

  3. ALL About the Mole… • We have now looked at the mole in terms of mass (g), particles, and volume. • HOWEVER…in order to do these conversions, one of our units had to be the mole. • What do you do, if you are asked to convert between two units and neither one is mole?

  4. Everything Goes Through The Mole! • To convert from one unit to another, you must use the mole as an intermediate step. • In other words…you might need a “two-step” conversion problem.

  5. What is a “Two-Step” Conversion Problem? • Two conversion factors • One to convert from given unit to moles • One to convert from moles to wanted unit

  6. Molar mass 6.02x1023 particles 1 mol Molar mass 1 mol 22.4 L 1 mol 1 mol 1 mol 1 mol 22.4 L 6.02x1023 particles Mole Road Map Volume of gas (STP) Mole Representative Particles Mass (atoms, molecules, or formula units) (grams)

  7. Here’s An Example Calculate the number of molecules in 60.0 g NO2. Given: 60.0 g NO2 1st Equality: Molar Mass Equality molar mass NO2 : 46.01 g 46.01 g = 1 mol 2nd Equality: Definition of Mole Equality 1 mol = 6.02 x 1023 molecules

  8. So here’s the equation: 60.0 g NO2x 1 mol x6.02 x 1023 molecules= 1 46.01 g NO21 mol 7.85 x 1023 molecules NO2

  9. Another Example Calculate the volume, in liters, of 3.24 x 1022 molecules of Cl2 (STP). 3.24 x 1022 molecules Cl2 x 1 mol x 22.4 L Cl2 = 1 6.022 x 1023 molecules1 mol 1.21 L Cl2

  10. What Now? • You will NOT be allowed to use your “Road Map” on the test, so you need to practice enough that you no longer rely on it to help you through solving these problems.

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