Question

Chemie Heterogeneous Reaction Chemical reactions may be envisioned in terms of reactants and products and written in the general form A +bB - C +dD Reactants Products The equilibrium constant may be expressed in the form K - LORD up or K, - P2 where [C] represents the molar concentration of Catequilibrium. For a given reaction, the concentrations at equilibrium would have to be determined experimentally. In application, there are practical cases where some of the reactants and/or products do not appear in the equilibrium constant expression. When there are pure solids or pure liquids involve, the concentrations are treated as constant for these substances, so they become part of the equilibrium constant 1. At 1000 K, the K, value is 19.9 for the reaction: Fe2O3(s) + 3 CO (g) = 2 Fe (s) + 3 CO2(g). What are the equilibrium pressures of CO and CO2 if 10 grams of iron (III)oxide and a 0.978 atm initial partial pressure of CO are placed in a flask? a. Write the equilibrium expression, kp, for the balanced chemical reaction: b. Determine the initial concentrations/pressure of each species present Fe2O3(s) + 3C0(8) - 2 Fe(s) – 3 CO2 (s) Initial concentration given, calculated or assumed to be OM The equilibrium constant expression is valid only for systems at equilibrium. When a system is not at equilibrium, the reaction quotient, can be written and calculated just as K is written and calculated. The concentrations used to calculate Q are any concentration other than the equilibrium concentration The value of Q with respect to K can indicate the direction the reaction must proceed to reach equilibrium • Q - K, the reaction is at equilibrium; • Q> K, the reaction will proceed in the direction that removes the product, moves to the left or the reverse direction; • Q< K, the reaction will proceed to the right or in the forward direction, to make product. c. Using the initial pressure to determine the value of Q and the direction of the reaction: d. Which direction will the reaction have to move to achieve equilibrium? 1 Page