1. MOLE (mol)‏ Particles (atoms or molecules)‏ DO NOW: Which conversion factor allows you to convert from moles to particles? 1 mol. 6.022 x 10 23 particles Which conversion factor allows you to convert from particles to moles? 6.022 x 10 23 particles. 1 mol

2. HOMEWORK

3. How many moles of are in 6.29 x 10 24 Al 3+ SO 4 2– Al 2 (SO 4 ) 3 aluminum sulfate ()‏ 1 mol Al 2 (SO 4 ) 3 6.022 x 10 23 m’c Al 2 (SO 4 ) 3 6.29 x 10 24 m’c Al 2 (SO 4 ) 3 molecules of Al 2 (SO4) 3 ? P mole M P = 10.4 mol Al 2 (SO 4 ) 3

4. How many molecules are in 3.15 mol of iron (III) hydroxide? Fe 3+ OH 1– Fe(OH) 3 3.15 mol Fe(OH) 3 ()‏ 6.022 x 10 23 m’c Fe(OH) 3 1 mol Fe(OH) 3 = 1.90 x 10 24 P mole M P molecules Fe(OH) 3

5. How many grams are in 5.16 mol magnesium? Mg 5.16 mol Mg ()‏ 24.31 g Mg 1 mol Mg = 125.4 g Mg mole M P

6. 1.29 mol Fe(NO 3 ) 2 What’s the mass of 1.29 mol ? Fe 2+ NO 3 1– Fe(NO 3 ) 2 iron (II) nitrate ()‏ 1 mol Fe(NO 3 ) 2 179.87 g Fe(NO 3 ) 2 = 232 g Fe(NO 3 ) 2 MOLAR MASS of Fe(NO 3 ) 2 1 formula unit of Fe(NO 3 ) 2 contains... 1 iron atom 2 nitrogen atoms 6 oxygen atoms # ElementMM (g)Total (g) 1Fe55.85 2N14.0128.02 6O16.0096.00 TOTAL MOLAR MASS179.87 P mol M P

7. QUICK SUMMARY Molar Mass vs. Atomic Mass 6.022x10 23 H = _______ H = _____ H 2 O = ________ H 2 O = _____ MgSO 4 = ________ MgSO 4 = _____ (NH 4 ) 3 PO 4 = _____ (NH 4 ) 3 PO 4 = ________ 1 amu 18 amu 120 amu 149 amu 1.01 g 18.02 g 120.39 g 149.12 g

8. HNO 3 (NH 4 ) 3 PO 4 # ElementMM (g)Total (g) 1H1.01 1N14.01 3O16.0048.00 TOTAL MOLAR MASS63.02 # ElementMM (g)Total (g) 3N14.0142.03 12H1.0112.12 1P30.97 4O16.0064.00 TOTAL MOLAR MASS149.12

9. 37.5 g KNO 3 How many mol are in 37.5g of ? K 1+ NO 3 1– KNO 3 potassium nitrate ()‏ 101.11 g KNO 3 1 mol KNO 3 = 0.371 mol KNO 3 P mole M P MOLAR MASS of KNO 3 1 formula unit of KNO 3 contains... 1 potassium atom 1 nitrogen atom 3 oxygen atoms # ElementMM (g)Total (g) 1K39.10 1N14.01 3O16.0048.00 TOTAL MOLAR MASS101.11