Molar Conversions Chap 3 & 7 Unit 6- The Mole:

Holy Mole! What is a mole? The mole is the SI unit for amount of substance. Other SI units (time=sec, length=meter, mass=kg)

Holy Mole! A mole (abbreviated mol) is the amount of a substance that contains as many particles as there are atoms in exactly 12 grams of carbon-12.

Mole, Mole, Mole A very amount!!!! The mole is a counting unit (like a dozen, pair, case) 1 mol = 6.02  1023 items (Items: atoms, molecules, formula units) A very amount!!!! LARGE

HOW LARGE IS IT??? 1 mole of hockey pucks would equal the mass of the moon! 1 mole of basketballs would fill a bag the size of the earth! 1 mole of pennies would cover the Earth 1/4 mile deep!

A mole of a substance contains NOT Avocado!!! A mole of a substance contains Avogadro’s number

Amedeo Avogadro Italian Scientist

Avogradro’s # The best modern value is 6.0221367 × 1023 This means that exactly 12 g of carbon-12 contains 6.0221367 × 1023 carbon-12 atoms.

Molar Mass Mass of 1 mole of an element or compound. Found by looking at the ATOMIC MASS on the periodic table Atomic mass tells the atomic mass unit of an atom (amu) unit: grams per mole (g/mol) Round to 2 decimal places

Molar Mass Examples carbon 12.01 g/mol aluminum 26.98 g/mol zinc

Molar Mass Examples sodium 22.99 g/mol sulfur 32.07 g/mol krypton

Molar Mass Examples water sodium chloride H2O 2(1.01) + 16.00 = 18.02 g/mol NaCl 22.99 + 35.45 = 58.44 g/mol

Molar Mass Examples sodium bicarbonate sucrose NaHCO3 22.99 + 1.01 + 12.01 + 3(16.00) = 84.01 g/mol C12H22O11 12(12.01) + 22(1.01) + 11(16.00) = 342.34 g/mol

Solve this: If you have 63 eggs, how many dozen of eggs are there Solve this: If you have 63 eggs, how many dozen of eggs are there? (must use railroad tracks) Roadmap: eggs  dozen 63 eggs 1 doz 12 eggs = 5.25 doz

Molar Conversions 6.02  1023 molar mass (particles/mol) (mol/g) MOLES IN GRAMS MOLES # of PARTICLES (molecules) (g/mol) (mol/particles)

Molar Conversion Examples How many moles of carbon are in 26 g of carbon? Road map: g  mol 26 g C 1 mol C 12.01 g C = 2.2 mol C

Molar Conversion Examples How many molecules are in 2.50 moles of C12H22O11? Road map: mol  molecules 6.02  1023 molecules 1 mol = 1.51  1024 molecules C12H22O11 2.50 mol

Molar Conversion Examples Find the mass of 2.1  1024 molecules of NaHCO3. Roadmap: molecules  mols  grams 2.1  1024 molecules 1 mol 6.02  1023 molecules 84.01 g 1 mol = 290 g NaHCO3