WHAT IS A MOLE? Info modified from: Image from:

COUNTING ATOMS Atoms are too small to count individually Use a counting unit called Avogadro's number Avogadro's number = 6.02 X atoms

WHAT IS A MOLE? Just as an amount of 12 is described by the term dozen, Avogadro's number is described by the term mole. A dozen eggs is 12 eggs; a mole of atoms is 6.02 X atoms.

Avogadro's number can be used to count anything. You could have a mole of apples or a mole of Ping-Pong balls. You can get some idea of the magnitude of Avogadro's number by considering that a mole of Ping-Pong balls would cover the surface of the Earth with a layer approximately 60 miles thick.

Equally important: one mole of a substance has a mass in grams equal to the formula weight of that substance. EX: one mole of glucose (C 6 H 12 O 6 ) contains 6.02 X molecules of glucose has a mass in grams equal to 180 g (12 X X X 6 )

MOLARITY = a measure of concentration of a solution given in moles/L Example: A 1.0 M solution of glucose is made by dissolving 180 g of glucose in enough water to equal 1 L How would you make a 0.5 M glucose solution? a 0.1 M glucose solution?

THINK ABOUT IT? If you ADD 180 g of glucose TO 1 L of water, do you have a 1 M solution? YOU WILL END UP WITH MORE THAN 1 L of SOLUTION

VOLUMETRIC FLASK Add your sugar Fill up to 1 L mark →