1. 10.1 THE MOLE Q4TP – CHEM MATT T.

2. THE MOLE: A MEASUREMENT OF MATTER What are three methods for measuring the amount of something? How is Avogadro’s number related to the molar mass of any substance? How is the atomic mass of an element related to the molar mass of an element? How is the mass of a mole of a compound calculated?

3. THE THREE METHODS You often measure the amount of something by one of three methods: Count Mass Volume

4. AVOGADRO’S NUMBER RELATIVITY A mole of any substance contains Avogadro’s number of representative particles, or 6.02 x 10 23 representative particles. A mole of ANY substance will contain Avogadro’s number.

5. ATOMIC MASS AND MOLAR MASS The atomic mass of an element expressed in grams is the mass of a mole of the element. You find the atomic mass under the element on the periodic table Molar mass is the atomic mass The mass of one mole of any element is the atomic mass

6. MASS OF A MOLE OF A COMPOUND To calculate the molar mass of a compound, find the number of grams of each element in one mole of the compound. Then add the masses of the elements in the compound. NaCl Sodium Chloride 58.44g