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Let the mixture has 100g as total mass.
So, The masses of CO and CO₂? are 90.55g and 100 − 90.55 = 9.45 g respectively.
Therefore, te number of moles of CO

                        n= 90.55 / 28 ?= 3.234.
The number of moles of CO₂? 

                        n= 9.45 / 44 ?= 0.215.
The mole fraction of CO

                         = 3.234? / (3.234+0.215) =0.938.
The mole fraction of CO₂?  

                         = 1−0.938=0.062.
The partial pressure of CO is the product of the mole fraction of CO and the total pressure.
It is 0.938×1=0.938 atm.
The partial pressure of carbon dioxide is 0.062×1=0.042 atm.
The expression for the equilibrium constant is: 
K_p?=? (P_CO)² / (P_CO2) ?=(0.938)² / (0.062) ?=14.19
Δn_g?= 2−1=1
K_c?= K_p?(RT)^−Δn=14.19×(0.0821×1127)⁻¹= 0.153.

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 Let x moles of BrCl decompose in order to attain the equilibrium. The initial molar concentration and the molar concentration at equilibrium point of different species may be represented as follows:
2BrCl₂?(g) ?→?Ar_2?(g)+Cl₂?(g)

3.3×10⁻³m        0             0

3.3×10⁻³−2αα?             α

∴ Kc?= (α×α)? /(3.3×10−3−2α)²

⇒ α² / (3.3×10−3−2α)²?=32

⇒ α / (3.3×10−3−2α)^2?=4

⇒ α=18.67×10−3−8 α

⇒ (1+ 8 α =18.67×10⁻³

⇒ α= 1.5162×10⁻³

∴ Molar concentration of BrCl at equation 

[BrCl] =3.3×10⁻³−2α

=3.3×10⁻³−2×1.562×10⁻³

=0.267×10⁻³M

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The initial partial pressures of CO and CO₂ are 1.40 atm and 0.8. atm respectively.
The expression for the reaction quotient is:
                        Q_p=P_CO2 / P_CO=0.80 / 1.4 = 0.571
As the value of the reaction quotient is greater than the value of the equilibrium constant, the reaction will move in the backward direction.
To attain the equilibrium, the partial pressure of CO₂ will decrease and the partial pressure of CO will increase.
Let p atm be the decrease in the partial pressure of CO₂. The increase in the partial pressure of CO will be p atm.
The equilibrium partial pressure of CO₂ is (0.80 – p) atm.
The equilibrium partial pressure of CO is (1.4 + p) atm.
The equilibrium constant is: 
                  K_p = P_CO2 / P_CO= (0.80p) / (1.4 + p) =0.265
 0.265 (1.4+p) = (0.80 – p)
0.371+0.265p = (0.80 – p)
                      p= 0.339 atm
The equilibrium partial pressure of CO is 1.4+0.339= 1.739.
The equilibrium partial pressure of CO₂ is 0.80?0.339= 0.461 atm.

Let the initial molar concentration of PCl₅ per litre = x mol
Molar concentration of PCl₅ at equilibrium = 0.05 mol
Therefore, moles of PCl₅ decomposed = (x – 0.05) mol
Moles of PCl₃ formed = (x – 0.05) mol
Moles of Cl₂ formed = (x – 0.05) mol
The molar conc./litre of reactants and products before the reaction and at the equilibrium point are:

K_c = [PCl₃] [Cl₂] / [PCl₅]

=> 8.3 x 10^-3 = (x – 0.05)² / 0.05

=> (x – 0.05) = (4.15 x 10^-4)^1/2 = 2.037 x 10^-2 = 0.02 moles

=>  x = 0.05 + 0.02 = 0.07 mol

Therefore, at equilibrium:

Moles of PCl₃ formed = (x – 0.05) mol = 0.07 – 0.05 = 0.02 mol
Moles of Cl₂ formed = (x – 0.05) mol = 0.07 – 0.05 = 0.02 mol