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.

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

HOMEWORK

How many moles of are in 6.29 x Al 3+ SO 4 2– Al 2 (SO 4 ) 3 aluminum sulfate ()‏ 1 mol Al 2 (SO 4 ) x m’c Al 2 (SO 4 ) x 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

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

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

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 ) 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) 1Fe N O TOTAL MOLAR MASS P mol M P

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 g g g

HNO 3 (NH 4 ) 3 PO 4 # ElementMM (g)Total (g) 1H1.01 1N O TOTAL MOLAR MASS63.02 # ElementMM (g)Total (g) 3N H P O TOTAL MOLAR MASS149.12

37.5 g KNO 3 How many mol are in 37.5g of ? K 1+ NO 3 1– KNO 3 potassium nitrate ()‏ g KNO 3 1 mol KNO 3 = 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) 1K N O TOTAL MOLAR MASS101.11