Question

The equilibrium concentrations for the reaction between carbon monoxide and molecular chlorine to form COCl2 (g) at 74oC are [CO] = 0.012 M, [Cl2] = 0.054 M, and [COCl2] = 0.14 M. Calculate Kp.

Answer 1

Solution :-

Balanced reaction equation

CO + Cl2 ---- > COCl2

Lets first calculate the Kc using the give equilibrium concnetrations

Kc= [COCl2] /[CO][Cl2]

Kc= 0.14 / 0.012*0.054

Kc= 216

Now lets calculate kp

Kp = Kc * RT^Delta n

Delta n = coefficient of product - coefficient of reactant

             = 1 – (1+1)

             = -1

74.0 C +273 = 347 K

Lets put the values in the formula

Kp = 216 * (8.314 J per mol K * 347 K)^-1

Kp = 0.075

So the Kp of the reaction is 0.075.