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Chemical Equilibrium

This resource explores the relationship between the equilibrium constants Kp and Kc, particularly for the reactions involving gases. Using examples like the conversion of NO and O2 to NO2, it explains how Kp can be expressed in terms of Kc. The document further discusses changes in equilibrium concentrations upon the addition of reactants or products and associations with reactions involving solid and gaseous phases. Additionally, it covers temperature effects on equilibrium shifts based on thermodynamic principles.

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Chemical Equilibrium

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  1. 0 Chemical Equilibrium Chemistry, The Central Science, 10th edition Theodore L. Brown, H. Eugene LeMay, Jr., and Bruce E. Bursten Donna Narsavage Heald Siena College Loudonville, NY  2006, Prentice-Hall

  2. 2NO (g) + O2 (g) 2NO2 (g) 0 What is Kp in terms of Kc for the following reaction ? • Kp = KcRT • Kp = Kc/RT • Kp = KcR/T • Kp = Kc • Kp = Kc/(RT)2

  3. 2NO (g) + O2 (g) 2NO2 (g) 0 What is Kp in terms of Kc for the following reaction ? • Kp = KcRT • Kp = Kc/RT • Kp = KcR/T • Kp = Kc • Kp = Kc/(RT)2

  4. P4 (s) + 6Cl2 (g) 4PCl3 (l) 0 What is the correct equilibrium constant expression for the reaction:

  5. P4 (s) + 6Cl2 (g) 4PCl3 (l) 0 What is the correct equilibrium constant expression for the reaction:

  6. 2NO (g) + O2 (g)2NO2 (g) NO NO2 0 Which accurately reflects the changes in concentration that will occur if O2 is added to disturb the equilibrium?

  7. 2NO (g) + O2 (g)2NO2 (g) NO NO2 0 Which accurately reflects the changes in concentration that will occur if O2 is added to disturb the equilibrium?

  8. PCl3 (g) + Cl2 (g) PCl5 (g) DH° = -87.9 kJ/mol 0 Which of the following will result in an equilibrium shift to the right? • Increase temperature/increase volume • Increase temperature/decrease volume • Decrease temperature/increase volume • Decrease temperature/decrease volume • None of the above PCl5

  9. PCl3 (g) + Cl2 (g) PCl5 (g) DH° = -87.9 kJ/mol 0 Which of the following will result in an equilibrium shift to the right? • Increase temperature/increase volume • Increase temperature/decrease volume • Decrease temperature/increase volume • Decrease temperature/decrease volume • None of the above PCl5

  10. 2CO(g) + O2(g) 2CO2(g) Kc = 5.0 x 1018 at 25 °C CO2(g) CO(g) + 1/2 O2(g) Kc = ?? at 25 °C 0 What is the value of Kc for the reaction? • Kc= 1/(5.0 x 1018)1/2 • Kc= 1/(2.5 x 1018) • Kc= -(5.0 x 1018)/2 • Kc= -(5.0 x 1018)1/2 • Kc= 2/(5.0 x 1018)1/2

  11. 2CO(g) + O2(g) 2CO2(g) Kc = 5.0 x 1018 at 25 °C CO2(g) CO(g) + 1/2 O2(g) Kc = ?? at 25 °C 0 What is the value of Kc for the reaction? • Kc= 1/(5.0 x 1018)1/2 • Kc= 1/(2.5 x 1018) • Kc= -(5.0 x 1018)/2 • Kc= -(5.0 x 1018)1/2 • Kc= 2/(5.0 x 1018)1/2

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