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by: Damian Jones

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# CH E THERMODYNAMICS II CH E 3322

Damian Jones
TTU
GPA 3.75

Staff

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Staff
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2
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## Popular in Chemical Engineering

This 2 page Class Notes was uploaded by Damian Jones on Thursday October 22, 2015. The Class Notes belongs to CH E 3322 at Texas Tech University taught by Staff in Fall. Since its upload, it has received 22 views. For similar materials see /class/226428/ch-e-3322-texas-tech-university in Chemical Engineering at Texas Tech University.

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Date Created: 10/22/15
Ch E 3322 Lecture 18 Fall 2007 Lecture 18 Calculation of the Chemical Reaction Equilibrium Constant Student Learning Objectives Describe the effects oftemperature pressure and excess reactants on the equilibrium conversion for a gas phase reaction using Le Chatelier s principle from Lecture 17 Describe the effect oftemperature on the chemical reaction equilibrium constan Calculate the equilibrium constant 39om thermodynamic data Calculate the temperature necessary to obtain a given conversion for a reversible reaction Le Chatelier39s Principle If an attempt is made to change the pressure temperature or concentration ofa system in equilibrium the equilibrium will shift if possible to diminish the magnitude ofthe alteration ABlt gtC quot 39 quot quot In which direction will the equilibrium shiit Iftemperature is increased f pressure is increased Ifthe concentration ofA is increased Ifthe concentration ofC is increased Chemical Reaction Equilibrium Constant K AG is the standard Gibbs energy change on reaction at temperature T Note that the standard state must be taken to be the same as for ff39 and is generally the pure species at 1 bar How does In K vary with temperature Ch E 3322 Lecture 18 Fall 2007 Dependence of the Chemical Reaction Equilibrium Constant K on Temperature RT RT R 7 dTRT quot d EInK Example Calculate K for the gasphase reaction of H2 and 02 to make water from 300 to 15 0 K Compare the answers for AH assumed to be constant with these if it is assumed to vary with temperature

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