Mole

The Mole Q: how long would it take to spend a mole of $1 coins if they were being spent at a rate of 1 billion per second?

Background: atomic masses ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The Mole ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The Mole: Answers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Mollionaire ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Comparing sugar (C 12 H 22 O 11 ) & H 2 O No, sugar has more (45:3 ratio) Yes (6.02 x 10 23 in each) Yes. No, molecules have dif. masses No, molecules have dif. sizes. 1 mol each Yes, that’s what grams are. mass? No, they have dif. molar masses # of moles? No, they have dif. molar masses # of molecules? No # of atoms? No, they have dif. densities. volume? 1 gram each Same

Molar mass ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],32.06 g/mol 64.06 g/mol 308.27 g/mol Calculate molar masses (to 2 decimal places) CaCl 2 (NH 4 ) 2 CO 3 O 2 Pb 3 (PO 4 ) 2 C 6 H 12 O 6 Cu x 3 = 63.55 x 3 = 190.65 B x 2 = 10.81 x 2 = 21.62 O x 6 = 16.00 x 6 = 96.00 308.27

Molar mass ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],32.06 g/mol 64.06 g/mol 308.27 g/mol Calculate molar masses (to 2 decimal places) CaCl 2 (NH 4 ) 2 CO 3 O 2 Pb 3 (PO 4 ) 2 C 6 H 12 O 6 110.98 g/mol (Ca x 1, Cl x 2) 96.11 g/mol (N x 2, H x 8, C x 1, O x 3) 32.00 g/mol (O x 2) 811.54 g/mol (Pb x 3, P x 2, O x 8) 180.18 g/mol (C x 6, H x 12, O x 6)

Converting between grams and moles ,[object Object],[object Object],[object Object],[object Object],[object Object],9.1 36.46 mol= g  g/mol 0.5419 98.08 g= g/mol x mol 207 58.44 mol= g  g/mol 0.0200 63.55 g mol g/mol g= g/mol x mol 0.25 HCl 53.15 H 2 SO 4 3.55 NaCl 1.27 Cu Equation mol (n) g g/mol Formula

Simplest and molecular formulae ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Cl Na Na Cl Cl Cl Na Na H O O H H O O H H O O H

Answers ,[object Object],[object Object],[object Object],[object Object],A - CH 2 A - H 2 O is both simplest and molecular C 4 H 10 is molecular (C 2 H 5 would be simplest) CH is simplest (not molecular since CH can’t form a molecule - recall Lewis diagrams) NaCl is simplest (it’s ionic, thus it doesn’t form molecules; it has no molecular formula) CH CH 2 O C 4 H 7 For more lessons, visit www.chalkbored.com

Mole

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