The Mole Concept

What is a mole?

a) Furry animal that lives undergroundb) Freckle with hair coming out of itc) Concept of quantity used in chemistryd) All of the above

Quantities of numbers:2 = pair 12 = dozen 144 = gross 500 = ream

6.02 x 10 23 = mole

The mole is a number unique to chemistry. It represents a specific quantity of chemical that is involved in a chemical reaction.

• Example: How long (in years) would it take to count to 1 mole, if you could count 5 atoms per second?

• Example: If you had 1 mole of dollars and could spend 1 million dollars every second until the mole was spent, how long (in years) would the money last?

We can’t measure a mole by counting!

We must use a reference point of:12 g of carbon = 1 mole

Experimentally the number 6.02 x 1023 atoms is equivalent to 12 g of carbon based on its atomic size and density of the atoms.• This is based on the same idea that 1 dollar =

100 pennies

Example: How many schloofs are in 5 wiggins?If: 1 yipper = 5 zonks, 1 zonk = 7 astra,1 astra = 2 wiggins, 4 schloofs = 1 yipper

Molecular Mass & Molar Mass

The mass of 1 mole of any atom on the Periodic Table is equal to its Atomic Mass Number.Ex. 1 mole gold = 196.97 g

= 6.02 x 1023 atoms

Ex. 1 mole of water (H2O) = 18.02 g (1.01 x 2 + 16.00)

= 6.02 x 1023 molecules