K c =
Organize Equilibrium Problems Using an ICE Data Table 21 Use ICE data tables to find: • Equilibrium concentrations of any component • Value of K eq In an experiment at constant temperature, 0.35 mol of CO and 0.40 mol of H 2 O were placed in a 1.00 L reaction vessel. At equilibrium, there were 0.19 mol CO remaining. (Where does all of this data fit into the table below?) 𝑪𝑪𝑪𝑪 𝒈𝒈 + 𝑯𝑯 𝟐𝟐 𝑪𝑪 𝒈𝒈 ⇋ 𝑪𝑪𝑪𝑪 𝟐𝟐 𝒈𝒈 + 𝑯𝑯 𝟐𝟐 ( 𝒈𝒈 ) CO(g) + H 2 O(g) ⇌ CO 2 (g) + H 2 (g) I. Initial (M) C. Change (M) E. Equilibrium (M) Data on eq. amount • Call x the change in concentration for a species with a coefficient of 1. Fill in the table. Use the data to solve for x . What is x ? • What are the equilibrium concentrations of all species? • What is the value of K eq ?
Lecture 11 Activity – ICE Tables 22 A one liter container holds 224 g of Fe and 5.00 moles of H 2 O(l). It is heated to 1000 K and reaches equilibrium. 56 g of Fe are left unreacted. 3 Fe(s) + 4 H 2 O(g) Fe 3 O 4 (s) + 4 H 2 (g) I. initial C. change E. equilibrium Data 1.What is the initial concentration in M of Fe? 2.What is the initial concentration in M of H2O? 3.What are the initial concentrations of Fe3O4and H2? Add all “initial” concentrations to the table below. 4. Assume “+x” is the change in concentration of Fe 3 O 4 . Use stoichiometry to fill in the rest of the “change” line. 5. Add the values for the ”initial” line to the values for the “change” line and enter them in the “equilibrium” line. 6.If the final amount of Fe is 56 g, what is the final concentration in M? Write this in the “Data” line of the table. 7.Set the expression for Fe(s) in the ”equilibrium” line of the table equal to the amount in the “Data” line of the table. What is the value of x? 8. Use the calculated value of x to determine the final concentrations of the other components. Write them in the “Data” line. 9.Plug the final concentrations from the “Data” line into the equilibrium expression. What is the value of Kcat this temperature? 10.What is the value of Kpat the same temperature?
- Spring '08
- Equilibrium, Keq