Unit 2: Atomic Theory & Structure Section 3: The Mole & Mole-Particle Conversions

Measure amounts of something with three different methods— Measuring Matter Measure amounts of something with three different methods— by count, by mass, and by volume. Which of these is measured by count? by mass/weight? by volume?

1 mole of atoms is 602,000,000,000,000,000,000,000 atoms!

602,000,000,000,000,000,000,000 particles Avogadro’s Number

The Pacific Ocean contains 1 mole of mL of water.

Which weighs more? Which has more animals? 6.02 x 1023 atoms of Ne 6.02 x 1023 atoms of C (20 grams) (12 grams) Which weighs more? Which has more atoms? The number of grams in a mole of particles is different by substance.

A mole of any substance contains Avogadro’s number of particles, or 6.02  1023 particles. (particles = atoms, molecules, etc.) Type 1 Moles Particles given mol x 6.02 x 1023 atoms = ______ atoms 1 mol Mole = Latin “pile, heap, or mass” Type 2 Particles Moles Given molecules x 1 mol = ___ mol 6.02 x 1023 molecules

Type 1 Moles Particles 2.12 mol x ______________ = 1 mol How many molecules are in 2.12 mol of propane gas (C3H8) ? 2.12 mol x ______________ = 1 mol 6.02 x 1023 molec = ______ molec 1.28 x 1024 molec in a BOX!!!

Type 2 Particles Moles 1 mol ___ mol 1.25 x 1023 atoms x _____________ = 6.02 x 1023 atoms 0.208 mol in a BOX!!!

How many moles is 2.17 x 1024 molecules of Br2 ? Type 2 Particles Moles 2.17 x 1024 molecules x ________________ = 6.02 x 1023 molecules 1 mol ___ mol 3.60 mol in a BOX!!!