3. Gram Atomic Mass 15 P Phosphorus 30.97 1 mole of an element is equal to its atomic weight expressed in grams 1 mole of phosphorus = 30.97 grams

4. Gram Formula Mass 15 P Phosphorus 30.97 11 Na Sodium 22.99 8 O Oxygen 16.00 What is the mass of 1 mole of Na 3 PO 4 ? Sodium: 3(22.99) = 68.97 grams Phosphorus: = 30.97 grams Oxygen: 4(16.00) = 64.00 grams + 1.00 moles of Na 3 PO 4 = 164 grams

5. MOLE Mass (g) Volume of a Gas (STP) Number of Representative Particles The Mole Map

6. MOLE Mass (g) Volume of a Gas (STP) Number of Representative Particles The Mole Map

7. How many grams of H 2 O are in 12.0 moles? 12.0 moles x 18.0 grams 1 mole = 216 grams

8. % Composition What is the % composition of Magnesium chloride? 12 Mg Magnesium 24.31 17 Cl Chlorine 35.45 GFM for MgCl 2 = 24.31 + 2(35.45) = 95.21 g %Mg = %Cl = 24.31g Mg 95.31 g MgCl 2 70.90g Cl 95.31 g MgCl 2 = 0.25506 x 100%= 25.51% Mg = 0.74489 x 100%= 74.49% Cl