LEC 11 CHAP 15 - Lecture 11 •  Using Keq to predict...

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Unformatted text preview: Lecture 11 •  Using Keq to predict the extent of a reaction. What does the size of Keq really tell us? •  Using Keq to calculate the extent of a reaction. Calculating equilibrium concentrations in order to find the yield of a reaction. •  Using Keq and Q to predict the direction of a reaction. TOUPADAKIS Lecture 11 Chapter 15 Using Keq to predict the extent of a reaction. What does the size of Keq really tell us? If the numerical value of Kc or Kp is neither very large nor very small, roughly in the range of about 10-10 to 1010, when the chemical system reaches the state of equilibrium, significant quantities of both reactants and products are present. K=0 Κ ≈ 10-10 Κ ≈ 1010 ∞ Mainly reactants Both reactants and products in significant quantities Mainly products TOUPADAKIS Lecture 11 Chapter 15 Equilibrium Constants Of Three Characteristic Reactions Reaction N2(g) + O2(g) H2(g) + I2(g) 2H2(g) + O2(g) 2NO(g) 2HI(g) 2H2O(g) Equilibrium Constant Kc 1.0x10-30 at 25 oC 57.0 at 700 K 2.4x1047 at 500 K TOUPADAKIS Lecture 11 Chapter 15 Using Keq to calculate the extent of a reaction. Calculating equilibrium concentrations. •  See examples in lecture. TOUPADAKIS Lecture 11 Chapter 15 Using the Keq and Q to Predict the Direction of a Reaction Reactants Products TOUPADAKIS Lecture 11 Chapter 15 ...
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This note was uploaded on 04/18/2010 for the course CHEM 2B 993029 taught by Professor Toupadakis during the Spring '10 term at UC Davis.

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