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1 Mole Relationships in Chemical Equations Copyright © 2007 by Pearson Education, Inc. Publishing as Benjamin Cummings Edited by bbg.

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Presentation on theme: "1 Mole Relationships in Chemical Equations Copyright © 2007 by Pearson Education, Inc. Publishing as Benjamin Cummings Edited by bbg."— Presentation transcript:

1 1 Mole Relationships in Chemical Equations Copyright © 2007 by Pearson Education, Inc. Publishing as Benjamin Cummings Edited by bbg

2 2 Law of Conservation of Mass Law of Conservation of Mass The Law of Conservation of Mass indicates that in an ordinary chemical reaction, Matter cannot be created or destroyed. No change in total mass occurs in a reaction. Mass of products is equal to mass of reactants.

3 3 Conservation of Mass + ReactantsProducts 2 moles Ag + 1 moles S = 1 mole Ag 2 S 2 (107.9 g) + 1(32.1 g) = 1 (247.9 g) 247.9= g = g

4 4 Consider the following equation: 4Fe(s) + 3O 2 (g) 2Fe 2 O 3 (s) This equation can be read in moles by placing the moles word moles between each coefficient and formula. 4 moles3 moles2 moles 4 moles Fe + 3 moles O 2 2 moles Fe 2 O 3 Reading Equations with Moles

5 5 A mole-mole factor is a ratio of the moles for any two substances in an equation. 4Fe(s) + 3O 2 (g) 2Fe 2 O 3 (s) Fe and O 2 Fe and O 2 4 moles Fe and 3 moles O 2 3 moles O 2 4 moles Fe Fe and Fe 2 O 3 Fe and Fe 2 O 3 4 moles Fe and 2 moles Fe 2 O 3 2 moles Fe 2 O 3 4 moles Fe O 2 and Fe 2 O 3 O 2 and Fe 2 O 3 3 moles O 2 and 2 moles Fe 2 O 3 2 moles Fe 2 O 3 3 moles O 2 Writing Mole-Mole Factors

6 6 Consider the following equation: 3 H 2 (g) + N 2 (g) 2 NH 3 (g) A. A mole-mole factor for H 2 and N 2 is 1) 3 moles N 2 2) 1 mole N 2 3) 1 mole N 2 1 mole H 2 3 moles H 2 2 moles H 2 B. A mole-mole factor for NH 3 and H 2 is 1) 1 mole H 2 2) 2 moles NH 3 3) 3 moles N 2 2 moles NH 3 3 moles H 2 2 moles NH 3 Learning Check

7 7 3H 2 (g) + N 2 (g) 2NH 3 (g) A. A mole-mole factor for H 2 and N 2 is 2) 1 mole N 2 3 moles H 2 3 moles H 2 B. A mole-mole factor for NH 3 and H 2 is 2) 2 moles NH 3 3 moles H 2 3 moles H 2 Solution

8 8 How many moles of Fe 2 O 3 can be produced from 6.0 moles O 2 ? 4Fe(s) + 3O 2 (g) 2Fe 2 O 3 (s) Relationship:3 mole O 2 = 2 mole Fe 2 O 3 Write a mole-mole factor to determine the moles of Fe 2 O mole O 2 x 2 mole Fe 2 O 3 = 4.0 moles Fe 2 O 3 3 mole O 2 Calculations with Mole Factors

9 9 Guide to Using Mole Factors Copyright © 2007 by Pearson Education, Inc. Publishing as Benjamin Cummings

10 10 How many moles of Fe are needed for the reaction of 12.0 moles O 2 ? 4Fe(s) + 3O 2 (g) 2 Fe 2 O 3 (s) 1) 3.00 moles Fe 2) 9.00 moles Fe 3) 16.0 moles Fe Learning Check

11 11 3) 16.0 moles Fe 16.0 moles Fe 12.0 moles O 2 x 4 moles Fe = 16.0 moles Fe 3 moles O 2 Solution


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