Lesson 1: The Mole and Molar Mass Unit 3: Moles Lesson 1: The Mole and Molar Mass

Counting Molecules How many molecules of sugar (C12H22O11) are in the beaker? There are approximately 6.02X1023 molecules of sugar in this beaker. We can also say that there is one mole of sugar molecules in this beaker. The mole is a unit we use to count molecules. Have a beaker containing a mole (342 g) of sugar. Have all students stand up, then sit down if they think it’s more than a thousand, ten thousand, etc. – 5 min

A mole is like a dozen! A mole is a unit (or have you heard?) containing 6.02X1023... You can think of a mole in the same way you think of a dozen. If you have a dozen eggs, you have 12 eggs. If you have a mole of molecules, you have 6.02X1023 molecules.

Molar Mass Molar mass is the mass of one mole of particles. The molar mass of an element is the mass shown on the periodic table, expressed in grams per mole.

Calculating Molar Mass Since a compound is made up of elements, its molar mass is the sum of the molar masses of the elements in it. Example: Find the molar mass of C12H22O11.

Brain Break!

Your Turn! Find the molar mass of: (NH4)2SO4 Cu(NO3)2·6H2O 15 min

Practice Makes Permanent! Pg. 80 #6 and 7 15 min