Answer:
The five assumption of Kinetic molecular theory are given below.
Explanation:
Kinetic molecular theory of gasses stated that,
1) Gases consist of large number of smaller particles which are distance apart from each others.
2) The gas molecules collide with each other and also with wall of container and this collision is elastic.
3) Gas molecules are in continuous random motion and posses kinetic energy.
4) The forces of attraction between gas molecules are very small and considered negligible.
5) The temperature of gas is directly proportional to average kinetic energy of gas molecules.
 
        
             
        
        
        
Your answer would be D, single replacement
        
             
        
        
        
Complete Question 
 The complete question is shown on the first uploaded image 
Answer:
The equilibrium constant is  
Explanation:
       From  the question we are told that
               The chemical reaction equation is 
       
The voume of the misture is   
  
   The molar mass of   is a constant with value of
 is a constant with value of  
     The molar mass of   is a constant with value of
    is a constant with value of  
     
     The molar mass of   is a constant with value of
    is a constant with value of  
Generally the number of moles  is mathematically given as 
                      
     For   
           
                                 
      For  
                
                                 
        For  
                          
                                               
Generally the concentration of a compound  is mathematicallyrepresented  as 
        
       For   
                 ![Concentration[Fe_2 O_3] = \frac{0.222125}{5.4}](https://tex.z-dn.net/?f=Concentration%5BFe_2%20O_3%5D%20%3D%20%5Cfrac%7B0.222125%7D%7B5.4%7D)
                                           
                          
        For  
                   ![Concentration[H_2] = \frac{1.815}{5.4}](https://tex.z-dn.net/?f=Concentration%5BH_2%5D%20%3D%20%5Cfrac%7B1.815%7D%7B5.4%7D)
                                            
       For  
                 ![Concentration [H_2O] = \frac{0.12}{5.4}](https://tex.z-dn.net/?f=Concentration%20%5BH_2O%5D%20%3D%20%5Cfrac%7B0.12%7D%7B5.4%7D)
                                                   
   The equilibrium constant  is mathematically represented as 
                 ![K_c = \frac{[concentration \ of \ product]}{[concentration \ of \ reactant ]}](https://tex.z-dn.net/?f=K_c%20%3D%20%5Cfrac%7B%5Bconcentration%20%5C%20of%20%5C%20product%5D%7D%7B%5Bconcentration%20%5C%20of%20%5C%20reactant%20%5D%7D)
   Considering 
             And      
 At  equilibrium the 
                     
                           