Chemical Quantities The Mole. Sample Problem #1

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1 Chemical Quantities The Mole Formula Based Problems A Mole Representative Particles Sample Problem #1 How many atoms are there in moles of? 1

2 Sample Problem #2 How many molecules are in moles of? Sample Problem #3 How many formula units are there in moles of? 2

3 Sample Problem #4 How many moles are there in molecules of? Atomic Mass Gram Atomic Mass What is the atomic mass of What is the formula mass of? What is the formula mass of? 3

4 Sample Problem #1 What is the formula mass of? Sample Problem #2 What is the formula mass of? 4

5 Sample Problem #3 What is the formula mass of? Gram Atomic Mass Gram Atomic Mass 5

6 Gram Molecular Mass Gram Molecular Mass Molar Mass Molar Masses of Gram Molecular Mass 6

7 Gram Molecular Mass What is the mass of one mole of? What is the mass of one mole of? How many grams are there in a mole? How many grams are there in a mole of? Mole Mass Conversions General Methods: Grams A x 1 mol A = mol A molar mass (grams) A Mol B x molar mass (grams) B = Grams B 1 mol B What is the mass of moles of? 7

8 Mole Mass Conversions General Methods: Grams A x 1 mol A = mol A molar mass (grams) A Mol B x molar mass (grams) B = Grams B 1 mol B How many moles are in g of? Sample Problem #1 What is the mass of moles of? First figure out the formula mass 8

9 Sample Problem #2 What is the mass of mol? First figure out the formula mass Sample Problem #3 How many moles are in bottle of? First figure out the formula mass 9

10 Sample Problem #4 How many moles are in Formula units of? Sample Problem #5 mol contains how many atoms? 10

11 Sample Problem #6 Formula units of how many moles equals The Mole is at the Center of Chemistry - Two Step Problems 11

12 Sample Problem #1 What is the mass of atoms of? Step 1 How many molecules in Sample Problem #2 First figure out the formula Mass for 12

13 Sample Problem #3 How many formula units in Figure out the formula Mass for How many grams in Sample Problem #4 Figure out the formula Mass for 13

14 The Volume of a Mole of Gas Standard Temperature and Pressure Molar Volume of a Gas SampleProblem What is the volume of Sample Problem #2 How many moles in of at STP? 14

15 Remember - The Mole is at the Center of Chemistry MASS PARTICLES g/mol 1 Mol mol/g 6.02 X MOLES 6.02 X mol Sample Problem contains how many at STP? 15

16 Molarity A measurement of the Moles in Solution molarity (M) = All parts of the solution have Remember - The Mole is at the Center of Chemistry MASS PARTICLES g/mol 1 Mol mol/g 6.02 X MOLES 6.02 X mol 16

17 Sample Problem #1 What is the of of in of solution? First figure out the formula Mass for Sample Problem #2 What is the of in a total volume of? First figure out the formula Mass for 17

18 Sample Problem #3 How many grams of do you need to dissolve in water to make The percent by What is A mole of Percent Composition 18

19 Sample Problem #1 A compound with a mass of What is the % composition of each element? Just divide C = O = H = Sample Problem #2 What is the % composition in compound with Na = O = H = 19

20 Sample Problem #3 mass with What is the mass of each component? C = H = F = The lowest Examples Empirical Formulas Name Hydrogen Peroxide Glucose Molecular Formula Empirical Formula Empirical Formulas are determined by 20

21 Sample Problem #1 In a sample that is empirical formula? If you have a 100 g sample that is Next you need to convert to moles g C 20.0 g H Now calculating what is the C: H: or empirically Sample Problem #2 A compound contains What is the empirical formula? Convert the mass of each element to moles Convert to whole number value by dividing by the smallest number of moles 21

22 Sample Problem #3 What is the Empirical formula for a compound containing Sample Problem #4 What is the Empirical formula for a compound containing 22

23 Sample Problem #5 What is the Empirical formula for a compound whose chemical composition is Molecular Formulas Molecular Formula Represent every Molecular formulas are determined by 23

24 Sample Problem #1 The empirical formula of glucose is It has been shown experimentally that the molar mass of glucose is What is the molecular formula for glucose? Empirical formula mass for glucose is: Molecular formula = Sample Problem #2 Molar mass of ß-carotene is g/mol and has an empirical formula of. What is the molecular formula for ß-carotene? 24

25 Ribose has a molar mass of Sample Problem #3 g/mol and a chem. comp. of What is its molecular formula? Sample Problem #4 The Molar Mass of a compound is g/mol and has What is its molecular formula? 25

26 Hydrates Molecules that when they crystallize have Hydrate Formulas Sample Problem #1 What is the formula of a compound that is Step 1 - How many moles of each? Step 2 - What is the ratio of moles? Hydrate formula = 26

27 Sample Problem #2 What is the formula of a compound that is Sample Problem #3 What is the formula of a compound that is 27

= 16.00 amu. = 39.10 amu

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