NOTES: Chemical Quantities (The Mole / Molar Mass) All Roads Lead to the Mole!!
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1 NOTES: Chemical Quantities (The Mole / Molar Mass) All Roads Lead to the Mole!!
2 What is a mole? A unit of measure used to count atoms, molecules, or ions A number: 6.02 x (Avogadro s number) 1 mol = 6.02 x (conversion factor)
3 Chemical Quantities consider another word that means a #: Measuring doughnuts: a DOZEN! 1 dozen = 12 doughnuts (count) 1 dozen = 500 g doughnuts (mass) 1 dozen = 1 box doughnuts (volume) Measuring hydrogen (H 2 gas): a MOLE! 1 mole = 6.02 x H 2 molecules (count) 1 mole = 2.0 g H 2 (mass) 1 mole = 22.4 L H 2 (volume) at STP
4 Count Amedeo Avogadro Lawyer who became interested in math and physics Discovered that equal volumes of different gases contained an equal number of particles. 9 years after his death, Joseph Loschmidt determined a constant and named it after Avogadro.
5 AVOGADRO S CONSTANT = 6.02 x Not to be confused with the delicious fruit
6 AVOGADRO S CONSTANT = 6.02 x mole = 6.02 x particles 1 mole = molar mass (grams) 1 mole (of a gas at STP) = 22.4 L The MOLE is to chemists as the DOZEN is to bakers.
7
8 Believe it or not, students all over the country celebrate National Mole Day! National Mole Day Foundation, INC. Mole Day
9 6.02 x Grains of Sand: Would be more than all of the sand on Miami Beach x Blood Cells: Would be more than the total combined number of blood cells found in every human on earth x Watermelon Seeds: Would be found inside a melon slightly larger than the moon x Pennies: Would make at least 7 stacks that would reach the moon x Donut Holes: Would cover the earth and be 5 miles (8 km) deep.
10 How big is Avogadro's number? An Avogadro's number of soft drink cans would cover the surface of the earth to a depth of over 200 miles. If you spread Avogadro's number of unpopped popcorn kernels across the USA, the entire country would be covered in popcorn to a depth of over 9 miles. If we were able to count atoms at the rate of 10 million per second, it would take about 2 billion years to count the atoms in one mole. If you count out loud starting with the number "one" at the rate of one count every second, it may take you about 1,909,577,942,668,696 years to finish. This is roughly 960,000 times the estimated lifetime of our universe (assuming 20 Billion years). Using a Pentium 450 MHz CPU, it will still take about 4,243,506 years to finish this task. This is a period of time about a thousand times longer than the total span of our civilization.
11 Why such a BIG number? because atoms, ions, molecules are SO small! 5 Pound Bag of Sugar contains 6.6 moles of C 12 H 22 O 11 molecules 1 Liter bottle of Water contains 55.5 moles H 2 0 of water molecules
12 Volume Mass Formula Units Ions R.P. Molecules Atoms
13 Types of Representative Particles: Molecules (breaks down into atoms) Atoms Formula Units (breaks down into ions) Ions
14 Naming Representative Particles (R.P.s): Pure Substance Element Compound Monatomic Polyatomic Molecular Ionic Charged Neutral MOLECULE MOLECULE FORMULA UNIT ION ATOM ATOMS ATOMS IONS
15 Naming Representative Particles (R.P.s): Examples: Name the representative particle for each substance given. For each molecule, state how many atoms are present. For each formula unit, state how many ions make up the ionic compound. H + : Cl 2 : C 2 H 6 : Cu(NO 3 ) 2 : Al: NaCl: ION MOLECULE 2 ATOMS per molecule MOLECULE 8 ATOMS FORMULA UNIT 3 IONS per Form.U. ATOM FORMULA UNIT 2 IONS per Form.U.
16 Mole R.P. Calculations (particle #) 1 mole = Avogadro s Number = 6.02 x R.P. s 1mol R.P R.P. 1mol R.P.
17 R.P. Example #1: How many moles are represented by 1.4 x molecules of H 2 O? molecules H 2 O mol molecules H 2 O 0.023mol H O 2
18 R.P. Example #2: How many molecules of CO 2 are present in 2.6 mol CO 2? 2.6 mol CO mol molecules CO 2 CO molecules CO 2
19 R.P. Example #3: How many individual atoms are in 5.2 mol CO 2? 5.2 mol CO molecules 1mol CO 2 CO 2 3 atoms 1 molecule CO atoms
20 Avogadro s Number Practice Problems: 1) How many moles of magnesium are represented by 1.25 x atoms of magnesium? ANSWER: 2) How many C 3 H 8 molecules are in 2.12 mol of propane (C 3 H 8 )? ANSWER:
21 Avogadro s Number Practice Problems: 1) How many moles of magnesium are represented by 1.25 x atoms of magnesium? ANSWER: mol Mg 2) How many C 3 H 8 molecules are in 2.12 mol of propane (C 3 H 8 )? ANSWER:
22 Avogadro s Number Practice Problems: 1) How many moles of magnesium are represented by 1.25 x atoms of magnesium? ANSWER: mol Mg 2) How many C 3 H 8 molecules are in 2.12 mol of propane (C 3 H 8 )? ANSWER: 1.28 x C 3 H 8 molecules
23 How about MOLES and MASS? when we measure out substances in the lab, it is not practical to count individual molecules instead, we can use a balance to weigh out a certain amount it is therefore useful to have a way to convert from moles to mass (and vice versa!)
24 MOLAR MASS a.k.a. Molecular Weight (MW) molar mass = mass of 1 mole of a substance Molar mass can be determined by adding up the atomic masses from the periodic table.
25 Molar Mass Example #1: Find the molar mass of CH 4. = 1C + 4H = (1.0) = 16.0 g/mol
26 Molar Mass Example #2: Find the molar mass of Mg(OH) 2. = Mg + 2O + 2H = (16.0) + 2(1.0) = 58.3 g/mol
27 Molar Mass Example #3: Find the molar mass of MgSO 4 7H 2 O. = Mg + S + 4O + 7(H 2 O) = (16.0) + 7(18.0) = g/mol
28 Molar Mass Practice Problems: Determine the molar mass of the following compounds: 1) H 2 O 2 2) Carbon tetrabromide 3) (NH 4 ) 2 CO 3 4) Aluminum sulfate 5) Ca(NO 3 ) 2
29 Molar Mass Practice Problems: Determine the molar mass of the following compounds: 1) H 2 O 2 : 34.0 g/mol 2) Carbon tetrabromide 3) (NH 4 ) 2 CO 3 4) Aluminum sulfate 5) Ca(NO 3 ) 2
30 Molar Mass Practice Problems: Determine the molar mass of the following compounds: 1) H 2 O 2 : 34.0 g/mol 2) Carbon tetrabromide : g/mol 3) (NH 4 ) 2 CO 3 4) Aluminum sulfate 5) Ca(NO 3 ) 2
31 Molar Mass Practice Problems: Determine the molar mass of the following compounds: 1) H 2 O 2 : 34.0 g/mol 2) Carbon tetrabromide : g/mol 3) (NH 4 ) 2 CO 3 : 96.0 g/mol 4) Aluminum sulfate 5) Ca(NO 3 ) 2
32 Molar Mass Practice Problems: Determine the molar mass of the following compounds: 1) H 2 O 2 : 34.0 g/mol 2) Carbon tetrabromide : g/mol 3) (NH 4 ) 2 CO 3 : 96.0 g/mol 4) Aluminum sulfate : g/mol Al 2 (SO 4 ) 3 5) Ca(NO 3 ) 2
33 Molar Mass Practice Problems: Determine the molar mass of the following compounds: 1) H 2 O 2 : 34.0 g/mol 2) Carbon tetrabromide : g/mol 3) (NH 4 ) 2 CO 3 : 96.0 g/mol 4) Aluminum sulfate : g/mol Al 2 (SO 4 ) 3 5) Ca(NO 3 ) 2 : g/mol
34 What is the mass of one mole of table salt (NaCl)? a) 23.0 g b) 35.5 g c) 58.5 g d) g Atomic mass Na = 23.0 g/mol Atomic mass Cl = 35.5 g/mol Mass of one mole of NaCl = = 58.5 g
35 Mole Mass Calculations 1 mole = molar mass (MW) in grams 1mol molar mass (g) molar mass (g) 1mol Mass
36 Molar Mass Example #1: How many grams are in 7.20 moles of dinitrogen trioxide? Dinitrogen trioxide = N 2 O 3 MW of N 2 O 3 = 2N + 3O = 2(14.0) + 3(16.0) = 76.0 g/mol 1 mole = 76.0 g N 2 O mol N O 76.0g g N O mol
37 Molar Mass Example #2: Find the number of moles in 92.2 g of iron(iii) oxide. Iron (III) oxide = Fe 2 O 3 MW of Fe 2 O 3 = 2Fe + 3O = 2(55.8) + 3(16.0) = g/mol 1 mole = g Fe 2 O g Fe 2 O mol 159.6g 0.578mol Fe 2 O 3
38 Gram Mole Conversion Practice Problems: 1) How many grams are in 1.77 mol of diphosphorus pentachloride? 2) Find the number of moles in g of iron(ii) chlorate. 3) Find the number of grams in 3.32 mole of KNO 3.
39 1) How many grams are in 9.45 mol of diphosphorus pentachloride? P 2 Cl 5 = g/mol 9.45mol P 2 Cl g 1.00mol 2260g P 2 Cl 5
40 2) Find the number of moles in g of iron(ii) chlorate. Fe(ClO 3 ) 2 = g/mol 107.5g Fe(ClO 3) mol g 0.482mol Fe(ClO 3) 2
41 3) Find the number of grams in 3.32 mole of KNO 3. KNO 3 = g/mol 3.32mol KNO g 1.00mol 336g KNO 3
42 What is the mass of 3.7 moles of NaCl? a) 15.8 g b) 58.5 g c) g d) 6.02 x g 3.7mol NaCl 58.5g NaCl 216.5g 1 mol
43 What is the mass of one mole of water (H 2 O)? a) 3.0 g b) 16.0 g c) 17.0 g d) 18.0 g Atomic mass H = 1.0 g/mol Atomic mass O = 16.0 g/mol Mass of one mole of H 2 O = 2(1.0) = 18.0 g
44 How many moles are in 152 g of water? a) mol b) 8.44 mol c) 2736 mol d) 6.02 x mol 152g H O 1mol g H O mol
45 Holy Moley I m glad that is over!
All Roads Lead to the Mole
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