STOICIOMETRY

S H O W I NG C

O N S E R V A T I ON T

H R O U G H

M A T H E M A T I CS

MOLE: ALLOWS US TO CONVERT FROM UNITS WE CAN MEASURE (MASS, VOLUME) TO WHAT WE CAN’T SEE (NUMBERS)

MOLE IS SORT OF LIKE A DOZEN

Does a dozen eggs have a certain mass? Is the mass of a dozen eggs different than the mass of a dozen chickens?

Mole is based off of the amount of atoms in 12.000 g of carbon.

Determined by the charge/mass ratio of electrons…and lots of physics!

A BALANCED EQUATION IS LIKE A RECIPE WHERE THE COEFFICIENTS ARE MOLES:

Using the term moles, describe this recipe in moles.

Then describe this recipe in grams and number of atoms/molecules! (Use factor label to find these!)

STARTING WITH WHAT WE HAVE AVAILABLE

Chemists never run recipes using the exact materials…they use the amounts they have available identify how many moles of each.

How many moles of Aluminum would 27 grams be?

How many moles of oxygen would 100 mL be?

How many atoms of each of the above would we be talking about?

PRACTICEIn your practice, you MUST use factor label! In this part of chemistry, factor label is critical to your success.