Question

1. The following gas phase equilibrium is established in a 2.0 L container: 2 C120 (g) 2 Cl2 (g) + O2(g) AH = - 161 kJ/mole State the direction the equilibrium will shift when the following changes (stresses) are made. Shift (right, left, or no shift) a) Increase [Cl20] b) Increase partial pressure of 02 c) Decrease the concentration of Cl2 d) Decrease the volume of the container to 1.0L e) Increase the temperature (no change in P) f) Add a catalyst g) Add argon gas to the container

Answer 1

Lechatelier's principle: A system at equilibrium will adjust to relieve stress when there are changed in the Concentration of reactant on product, the temperature of reaction, the partial pressures of Case 1: If the Concetration of reactant increased, the equilibrium Shifts toward & right side il product Side If we increase the concentration of product, the equilibrion shift towards left ire reactant side Increase of partial pressure of gas : partial pressure of gaseous reactant increased, the equilihmum position shift towards decrease in tid wessure ire decrease in number of moles of partial gaseous component Felect of volume: If volume decreased, the reaction will shift towards the side of the reaction that has fewer gaseous molecules (less no. of molele side)

Fax Effect of temperature: For in temperature the equilibrium shirt exothermic , increase towards left side the equilibrium will For endothermic increase in temperature Shift towards right side. Esfect Of Catalyst : 1. No effect on the position of the equilibrium Effect of inert gas at constant volume NO effect on the position of the equilibri um cele 20968) +0319) =-161.JPondel do 26190/99 = AH = -ve, So it is exothermic reaction =2 lie acho) No of moles of reactants an of moles of products =3 (2elet 1 oz) equilibrium Shift towards right side (a) Increase [[120 increase in concentration towanide sight side. of reactants , the equilibrium chist

cbi Increase partial pressure left side moles of reactant has less number, so increase in ressure of on the equilibrium Shift towards no. of moles less number side ie left side. - 10 Decrease the concentration of ch right side (d) Decrease the volume to it lest night side volume decreases, equilibrium shift towards fewer gaseous molecules ie left side. Lei Increase in the temperature left side For exothermic, increase the temperature equilibriom Shift towards at left side (8) Add a catalyst No Shift I cgl Add. Argon to the NO Shift Container