1. MOLE (mol)‏ Mass (g)‏ Particles (atoms,m’c or f.u.) DO NOW: Copy the conversion factors that allow you to convert from mass to moles and from particles to moles. 1 mol. 6.022 x 10 23 particles 1 mol. molar mass (g)‏ Which conversions factors allow you to convert from moles to grams and/or particles? 6.022 x 10 23 particles.. 1 mol molar mass (g). 1 mol ‏

2. HOMEWORK

3. 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

4. 1.29 mol What’s the mass of 1.29 mol ? Fe 2+ NO 3 1– Fe(NO 3 ) 2 iron (II) nitrate ()‏ 1 mol 179.87 g = 232 g P mole M 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

5. 37.5 g How many mol are in 37.5g of ? K 1+ NO 3 1– KNO 3 potassium nitrate ()‏ 101.11 g 1 mol = 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

6. 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 6.022 x 10 23 f.u. 6.29 x 10 24 f.u. f.u.? P mole M P = 10.4 mol Al 2 (SO 4 ) 3

7. How many formula units is 3.15 mol of iron (III) hydroxide? Fe 3+ OH 1– Fe(OH) 3 3.15 mol ()‏ 6.022 x 10 23 f.u. 1 mol = 1.90 x 10 24 P mole M P f.u. Fe(OH) 3

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