AN ANECDOTE “How do you get to the Lincoln Center for the Performing Arts ?” “ Practice, practice, practice….” An `out-of-towner’ visiting NYC for the first time asks Joshua Bell (world’s greatest violinist): Joshua’s answer (supposedly):

Some “Sweet” Mole Calculations Sucrose  2 glucose C 11 H 22 O 11 2 C 6 H 12 O 6 In CokeWhat your body burns

The result of steady Coke drinking……

a)weight per mole (MW): what does a mole of C 6 H 12 O 6 weigh ? (C=12; H=1; O=16) 6* *1 + 6*16 = 180 g/mol 1.1) mole to mass: how many g C 6 H 12 O 6 of are present in mole of C 6 H 12 O 6 ? mol * 180 g/mol = 1 g 1.2) mass to mole: how many moles of C 6 H 12 O 6 are in 360 g of C 6 H 12 O 6 ? mole calculations part g/180 g mol -1 = 2 moles

mole calculations part 1 (continued) 1.3) mole to # molecule: how many molecules of C 6 H 12 O 6 are in 0.5 mol of C 6 H 12 O 6 ? 0.5 mol *6*10 23 molecules/mol = 3*10 23 molecules 1.4) mass to # molecules: how many molecules of C 6 H 12 O 6 are in 120 g of C 6 H 12 O 6 ? (120/180) mol * 6*10 23 molecules =4*10 23 molecules mol

1.5) # molecules to moles: how many moles in 3*10 24 molecules of C 6 H 12 O 6 ? 3*10 24 molecules/ 6*10 23 molecules/mol = 5 moles 1.6) # molecules to mass : How many grams of C 6 H 12 O 6 are in 2.0 *10 22 molecules of C 6 H 12 O 6 ? 2*10 22 molecules * 180 g 6*10 23 molecules/mol mol = * 180 = 6 grams mole calculations part 1 (continued)

A.7.27*10 21 B C.82.9 D.2.48* E.My answer isn’t above The gram molecular mass of of ‘crystal meth’) is g/mol. How many moles of crystal meth are in a typical street `teenth’ = 1/16 of an ounce= 1.80 grams ? (1 mol count=6.022*10 23.)

B1-Aflatoxin (MW=328.2 g/mol) is a naturally occurring, horribly toxic poison derived from Aspergillus fungi, a common contaminant in corn. It causes cancer in most humans at the staggeringly low exposure level of 1*10 17 molecules. What is the equivalent mass of aflatoxin represented by this count ? ( 1 mol count=6.022*10 23.) A.3.28* g B.1.84*10 -4 g C. 5.45*10 -5 g D.5.06* g E.1.98* g F.6.02*10 6 g G.My answer isn’t above

Micro chip manufacture requires nearly oxygen- free conditions wherein the concentration of O 2 is at or below 17 pg/L. Given that the atomic mass of O is 16 g/mol, about how many molecules of O 2 /L does this represent ? Note: 1 mol count=6.022*10 23 A.5.4*10 24 B.3.5*10 22 C.5.3*10 22 D.3.2*10 11 E.6.4*10 12 F.1.9*10 13 G.My answer isn’t above

Moles: part 2 body parts (mole ratio) math: the knee bone is connected to the thigh bone….

11 people How many hands ??? hands 1 people x = 22 hands

How many toes connected to the hands (assuming no deformities) ? hands 1 person hand x 10 toes person x = 50 toes

Simplest `body’ parts example : mole  Mole Octane = C 8 H 18 How many H are in 20 moles of octane ? 20 mols octane * 18 mol H = 360 mol H mol octane

Isohexane has the formula C 6 H 14. How many C moles are present if we have moles of isohexane ? A mol C B.1.00 mol C C.36 mol C D mol E.None of the above

`body’ parts example 2 : Weight  moles first, then mol  Mol Octane = C 8 H 18 How many moles of octane contain 24 grams of C (at. wt. = 12 g/mol) 24 g = 2 moles C 12 g/mol C Step 1) Convert grams C to moles C (all roads lead through moles divide up)

`body’ parts example 2 : (continued) Octane = C 8 H 18 How many moles of octane contain 24 grams of C (at. wt. = 12 g/mol) Step 2) 2 moles C => how many moles octane? 1 mol octane = x 8 mol C 2 x= 2/8=0.25 moles octane (body parts relationship ?)

Isohexane has the formula C 6 H 14. How many moles of isohexane are formed with 24 grams of C (1 mol C=12 g) A moles isohexane B.2 moles isohexane C moles isohexane D.3 moles isohexane E.Stoichiometry blows F. None of the above

`body’ parts example 3 : Weight  moles, then mol  Mol  weight Octane = C 8 H 18 (MW=114) How many grams of H are in 10 grams of Octane ? (1 mole H=1 g H) Step 1) Convert grams octane to moles octane All roads lead through moles; divide up 10 g = mol octane 114 g/mol

`body’ parts example 3 (continued) : Octane = C 8 H 18 (MW=114) How many grams of H are in 10 grams of Octane ? (1 mole H=1 g H) Step 2) Relate moles H to moles octane (body parts relationship ?) 14 mol H = x 1 octane x= 14*0.0877=1.228 mol H

`body’ parts example 3 (continued) : Octane = C 8 H 18 (MW=114) How many grams of H are in 10 grams of Octane ? (1 mole H=1 g H) Step 3) convert moles H to grams H (multiply down) mol H * 1 g H/mol=1.228 mol H

Isohexane has the formula C 6 H 14. How many grams of H (at. Wt. = 1 g/mol) are combined in 300 grams of C 6 H 14 (MW=86 g/mol) A g H B.1.32 g H C g H D g H E g H