MOLE CONVERSIONS Which conversion factors allow you to convert from mass to moles and from particles to moles. molar mass (g) . 1 mol ‏ 6.022 x 1023 particles.

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Presentation transcript:

MOLE CONVERSIONS Which conversion factors allow you to convert from mass to moles and from particles to moles. molar mass (g) . 1 mol ‏ 6.022 x 1023 particles . . 1 mol MOLE (mol)‏ Particles (atoms,m’c or f.u.) Mass (g)‏ 1 mol . molar mass (g)‏ 1 mol . 6.022 x 1023 particles Which conversions factors allow you to convert from moles to grams and/or particles?

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Read 8.4 & 8.5 #’s 12,14,17,20cd Chapter 8 Quiz on Thurs 3/2 HOMEWORK Read 8.4 & 8.5 #’s 12,14,17,20cd Chapter 8 Quiz on Thurs 3/2 covering 8.1 - 8.5

QUICK SUMMARY the mole is a chemist’s bridge out of the atomic world (amu) into the real world (g)! Atomic Mass vs. Molar Mass 6.022x1023 particles H2 = _______ H2O = ________ MgSO4 = ________ (NH4)3PO4 = ________ 2 amu 18 amu 120 amu 149 amu H2 = _____ H2O = _____ MgSO4 = _____ (NH4)3PO4 = _____ 2 g 18 g 120 g 149 g

( )‏ M P aluminum sulfate How many moles of are in 6.29 x 1024 f.u.? Al3+ SO42– mole Al2(SO4)3 M P ( )‏ 1 mol Al2(SO4)3 6.29 x 1024 f.u. Al2(SO4)3 = 10.4 mol 6.022 x 1023 f.u. Al2(SO4)3 Al2(SO4)3

( )‏ M P How many formula units is 3.15 mol of iron (III) hydroxide? mole Fe3+ OH1– Fe(OH)3 M P ( )‏ 3.15 mol Fe(OH)3 6.022 x 1023 f.u. Fe(OH)3 = 1.90 x 1024 1 mol Fe(OH)3 f.u. Fe(OH)3

Nitric Acid MOLAR MASS PRACTICE… Ammonium Phosphate # # (NH4)3PO4 HNO3 Element MM (g) Total (g) 1 H 1.01 N 14.01 3 O 16.00 48.00 TOTAL MOLAR MASS 63.02 # Element MM (g) Total (g) 3 N 14.01 42.03 12 H 1.01 12.12 1 P 30.97 4 O 16.00 64.00 TOTAL MOLAR MASS 149.12 Nitric Acid Ammonium Phosphate

( )‏ # M P What’s the mass of 1.29 mol ? iron (II) nitrate mole Fe2+ NO31– Fe(NO3)2 M P ( )‏ 179.87 g Fe(NO3)2 1.29 mol Fe(NO3)2 = 232 g Fe(NO3)2 1 mol Fe(NO3)2 # Element MM (g) Total (g) 1 Fe 55.85 2 N 14.01 28.02 6 O 16.00 96.00 TOTAL MOLAR MASS 179.87 MOLAR MASS of Fe(NO3)2 1 formula unit of Fe(NO3)2 contains... 1 iron atom 2 nitrogen atoms 6 oxygen atoms

( )‏ # M P How many mol are in 37.5g of ? potassium nitrate K1+ NO31– KNO3 mole M P ( )‏ 1 mol KNO3 37.5 g KNO3 = 0.371 mol KNO3 101.11 g KNO3 # Element MM (g) Total (g) 1 K 39.10 N 14.01 3 O 16.00 48.00 TOTAL MOLAR MASS 101.11 MOLAR MASS of KNO3 1 formula unit of KNO3 contains... 1 potassium atom 1 nitrogen atom 3 oxygen atoms