Chemistry

Chapter 11

The Mole

Counting “Terms”

• Dozen

• Baker’s Dozen

• Pair

• Ream

• Gross

Chemistry Counting “term”

• The Mole

– (mol)

• 6.02 x 1023

• Avogadro’s Number

• SI unit for measuring the amount of a substance

• # of atoms in 12 grams of pure Carbon-12

6.02 x 1023

• 602,000,000,000,000,000,000,000• 1 mol of water = 18 ml• 1mol of pennies = stack the pennies – the stack

could reach to the sun and back 2 billion times• 1 mol of dollars = could not all be spent even if

you spent a billion dollars a day over a trillion years

• 1 mol paperclips – could wrap around the world 400 trillion times

Conversions

• Moles to Particles• Ex. P. 311

mole

particlesxmolx

1

1002.6#

23

Conversions

• Particles to moles• Ex. Page 312

231002.6

1#

x

moleparticles

Conversions

• The mass in grams of one mole of any pure substance is called its “molar mass”

• Molar mass of any element equals its atomic mass– Unit = g/mol

– Ex. 1 mol Fe = 55.845 grams– 1 mol NaCl = 22.99 + 35.453 = 58.443

Conversions

• Mol to mass• Ex. P. 316

mol

snumbergramnumbermol

1

Conversions

• Mass to mol• Ex. P 316

snumbergram

molgramsnumber

1.