Unit 5 Topic1 The Mole 1

Collection Terms 1 trio= 3 singers 1 six-pack Cola=6 cans Cola drink 1 dozen donuts=12 donuts 1 gross of pencils=144 pencils 2

A Moles of Particles Contains 6.02 x (Avogadro’s number)particles 1 mole C = 6.02 x C atoms 1 mole H 2 O = 6.02 x H 2 O molecules 1 mole NaCl = 6.02 x NaCl = 6.02 x Na + ions and 6.02 x Cl – ions 3

Examples of Moles Moles of elements 1 mole Mg = 6.02 x Mg atoms 1 mole Au = 6.02 x Au atoms Moles of compounds 1 mole NH 3 = 6.02 x NH 3 molecules 1 mole C 9 H 8 O 4 = 6.02 x aspirin molecules 4

Ratio to use in unit conversion 6.02 x particles 1 mole or 1 mole 6.02 x particles 5

Learning Check 1. Number of atoms in mole of Al 1) 500 Al atoms 2) 6.02 x Al atoms 3) 3.01 x Al atoms 2.Number of moles of S in 1.8 x S atoms 1) 1.0 mole S atoms 2) 3.0 mole S atoms 3) 1.1 x mole S atoms 6

Solution 1. Number of atoms in mol of Al 3) 3.01 x Al atoms mol Al 6.02 x Al atoms 1 mol Al 2. Number of moles of S if a sample of S contains 4.50 x S atoms 2) 3.0 mole S atoms 4.50 x S atoms 1 mol S 6.02 x S atoms 7

Practice Problems-R side 1. How many atoms are in 2.5 mol Zn? 2. How many molecules are in 0.7 mole water? 3. How many moles are in 5.75x10 24 atoms of Al? 4. How many moles are in 2.50x10 20 atoms of Fe? 8

Unit 5 topic 2 Mole and molar mass conversion 9

Molar Mass Number of grams in 1 mole Equal to the atomic mass from the periodic table. Just add the unit “gram.” Mass of One C atom = 12.0 amu Mass of 1 mole of C atoms = 6.02 X C atoms = 12.0 g 10

Learning Check A. 1 mole of Br atoms =________gram B.1 mole of Sn atoms =________gram 11

Molar Mass of Compounds 1 mole of CaCl 2 (1 Ca x 40.1 g + 2 Cl x 35.5 g) = g/mole 1 mole of N 2 O 4 (2 moles N x 14.0 g/mole + 4 moles O x 16.0 g/mole) = 92.0 g/mole 12

Learning Check-R side A. 1 mole of K 2 O = ______g B. 1 mole of antacid Al(OH) 3 = ______g 13

Solution A. 1 mole of K 2 O= 94.2 g 2 K x 39.1 g/mole + 1 O x 16.0 g/mole B. 1 mole of antacid Al(OH) 3 = 78.0 g 1 Al x 27.0 g/mole + 3 O x 16.0 g/mole + 3 x

Learning Check Prozac, C 17 H 18 F 3 NO, is a widely used antidepressant that inhibits the uptake of serotonin by the brain. It has a molar mass of 1) 40.0 g/mole 2) 262 g/mole 3) 309 g/mole 15

Solution Prozac, C 17 H 18 F 3 NO, is a widely used antidepressant that inhibits the uptake of serotonin by the brain. It has a molar mass of 3) 309 g/mole 17C (12.0) + 18H (1.01) + 3F (19.0) + 1N (14.0) + 1 O (16.0) 16

Ratio to use in unit conversion Molar mass (gram) 1mole or 1 mole molar mass (gram) 17

Molar mass (gram) 6.02 x Particles or 6.02 x particles Molar Mass(gram) 18

Learning Check Acetic acid CH 3 COOH is the acid in vinegar. It has a molar mass of 60.0 g/mole. 1 mole of acetic acid = ____________ 1 mole acetic acid or g acetic acid g acetic acid 1 mole acetic acid 19

Solution Acetic acid CH 3 COOH is the acid in vinegar. It has a molar mass of 60.0 g/mole. 1 mole of acetic acid = 60.0 g acetic acid 1 mole acetic acid or 60.0 g acetic acid 60.0 g acetic acid1 mole acetic acid 20

Moles and Grams Aluminum is often used for the structure of light-weight bicycle frames. How many grams of Al are in 3.00 moles of Al? 3.00 moles Al ? g Al 21

1. Molar mass of Al1 mole Al = 27.0 g Al 3. Setup3.00 moles Al 27.0 g Al 1 mole Al Answer = 81.0 g Al 22

Learning Check The artificial sweetener aspartame (Nutri- Sweet) formula C 14 H 18 N 2 O 5 is used to sweeten diet foods, coffee and soft drinks. How many moles of aspartame are present in 225 g of aspartame? 23

Solution 1. Molar mass of Aspartame C 14 H 18 N 2 O 5 (14 x 12.0) + (18 x 1.01) + (2 x 14.0) + (5 x 16.0) = 294 g/mole 1mole of aspartame = 294 g aspartame 2. Setup 225 g aspartame 1 mole aspartame 294 g aspartame = mole aspartame 24

Methane CH 4 known as natural gas is used in gas cook tops and gas heaters. How many grams are in 2.3 x molecules of methane? 25