Predict and calculate the effect of volume change on an equilibnium system. Cons

Question

Predict and calculate the effect of volume change on an equilibnium system. Consider the equilibrium between COCh CO and Ch coC)COE) Ch(e) 0.112 at 904 K The reaction is allowed to reach equilibriurn in a 17.8 L flask. At equilibrium [COC12-??77M [Col-o? 41 M and [Ci2] (a) The equilibrium mixture is transfetred to a $.90 L, fask in whuch durection will the reaction proceed to reach equilbrium? 0.141 M b) Calculate the new equilibriom concentrations that result when the equil?brium mixture is transferred to a $.90-L flask coCl [C12]

Explanation / Answer

At equilibrium in 17.8 L

Moles of COCl2 = molarity x volume

= 0.177 mol/L x 17.8 L

= 3.1506 mol

Moles of CO = molarity x volume

= 0.141 mol/L x 17.8 L

= 2.5098 mol

Moles of Cl2 = molarity x volume

= 0.141 mol/L x 17.8 L

= 2.5098 mol

Part b

New equilibrium concentrations

Molarity of species in 8.90 L

Molarity of COCl2 = moles/Volume

= 3.1506 mol/8.90 L

= 0.354 M

Molarity of CO = moles/Volume

= 2.5098 mol/8.90 L

= 0.282 M

Molarity of Cl2 = moles/Volume

= 2.5098 mol/8.90 L

= 0.282 M

Part a

New equilibrium constant

K' = [CO] [Cl2] /[COCl2]

= (0.282*0.282)/0.354

= 0.2246

K' (0.2246) > K (0.112)

Equilibrium shifts to the left

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