CHAPTER 17 - CHAPTER 17: Chemical Equilibrium 1 Basic...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
1 CHAPTER 17: Chemical Equilibrium
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Basic Concepts Reversible reactions do not go to completion. They can occur in either direction Symbolically, this is represented as: ( 29 ( 29 ( 29 ( 29 g g g g D d + C c B b + A a
Background image of page 2
3 Basic Concepts Chemical equilibrium exists when two opposing reactions occur simultaneously at the same rate. A chemical equilibrium is a reversible reaction that the forward reaction rate is equal to the reverse reaction rate. Chemical equilibria are dynamic equilibria. Molecules are continually reacting, even though the overall composition of the reaction mixture does not change.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Basic Concepts Graphically, this is a representation of the rates for the forward and reverse reactions for this general reaction. ( 29 ( 29 ( 29 ( 29 g g g g D d + C c B b + A a
Background image of page 4
5 Basic Concepts One of the fundamental ideas of chemical equilibrium is that equilibrium can be established from either the forward or reverse direction. Consider the reaction: ) ( 2 ) ( ) ( 2 3 2 2 g SO g O g SO +
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 Basic Concepts
Background image of page 6
7 Basic Concepts
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8 The Equilibrium Constant For a simple one-step mechanism reversible reaction such as: The rates of the forward and reverse reactions can be represented as: [ ][ ] [ ][ ] rate. reverse the represents which D C k Rate rate. forward the represents which B A k Rate r r f f = = + + (g) (g) (g) (g) D C B A
Background image of page 8
9 The Equilibrium Constant Similarly, for the general reaction: we can define a constant [ ] [ ] [ ] [ ] reactions. all for valid is expression This B A D C K products reactants b a d c c = + + D d C c B b A a (g) (g) (g) (g) Concentrations in mol/L.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
10 The Equilibrium Constant Example 17-1: Write equilibrium constant expressions for the following reactions at 500 o C. All reactants and products are gases at 500 o C. [ ][ ] [ ] 5 2 3 c 2 3 5 PCl Cl PCl K Cl PCl PCl = +
Background image of page 10
11 The Equilibrium Constant Example 17-2: One liter of equilibrium mixture from the following system at a high temperature was found to contain 0.172 mole of phosphorus trichloride, 0.086 mole of chlorine, and 0.028 mole of phosphorus pentachloride. Calculate K c for the reaction. Equil []’s 0.028 M 0.172 M 0.086 M + 2 3 5 Cl PCl PCl
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
12 The Equilibrium Constant [ ][ ] [ ] ( 29 ( 29 ( 29 53 . 0 K 028 . 0 086 . 0 172 . 0 K PCl Cl PCl K c c 5 2 3 c = = =
Background image of page 12
13 The Equilibrium Constant Example 17-3: The decomposition of PCl 5 was studied at another temperature. One mole of PCl 5 was introduced into an evacuated 1.00 liter container. The system was allowed to reach equilibrium at the new temperature. At equilibrium 0.60 mole of PCl 3 was present in the container. Calculate the equilibrium constant at this temperature.
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
14 ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 T another at 90 . 0 40
Background image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 64

CHAPTER 17 - CHAPTER 17: Chemical Equilibrium 1 Basic...

This preview shows document pages 1 - 15. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online