Mastering Chemistry Chapter 16: Question #8 Calculating Equilibrium Constants Pa

Question

Mastering Chemistry Chapter 16: Question #8

Calculating Equilibrium Constants Part A The equilibrium constant, K, of a reaction at a particular temperature is determined by the concentrations or pressures of the reactants and products at equilibrium. Phosgene (carbonyl chloride), COCl2, is an extremely toxic gas that is used in manufacturing certain dyes and plastics. Phosgene can be produced by reacting carbon monoxide and chlorine gas at high temperatures CO (g) + C12 (g) COC12 (g) For a gaseous reaction with the general form Carbon monoxide and chlorine gas are allowed to react in a sealed vessel at 475 °C.At equilibrium, the concentrations were measured and the following results obtained the Kc and p expressions are given by the Kc and K Partial Pressure Gas CO Cl COCl2 atm 0.840 1.20 0.240 The subscript c or p indicates whether K is expressed in terms of concentrations or pressures. Equilibrium-constant expressions do not include a term for any pure solids or liquids that may be involved since their composition does not change throughout the reaction. The standard substance itself, and although the quantity may change the sample remain pure. The concentration is effectively equal to 1 and will not impact the magnitude of K What is the equilibrium constant, Kp, of this reaction? Express your answer numerically state of a pure substance is the pure Submit Hints My Answers Give Up Review Part

Explanation / Answer

part A

CO(g) + Cl2(g) ----> COcl2(g)

Kp = pCOcl2/pCl2*pCO = 0.24/(1.2*0.84) = 0.24

kp= 0.24

part B

H2(g) + I2(g) ----> 2HI(g)

Kc = [HI]^2/[H2][I2]

at equilibrium

[HI] = 2*2.92 = 5.84 M

[H2] = 4-2.92 = 1.08 M

[I2] = 0.08 M

   Kc = (5.84^2/(0.08*1.08))

      = 394.74

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