Question

At 473 K, in the given equilibrium reaction what would be effect on Kc it temperature is increased
PCl5 (g) PCl3(g) + Cl2 (g) rH0 = 124.0 kJ mol–1​

Answer 1

Answer:

Explanation:

Answer

(a) The equilibrium constant expression is

K  

c

​  

=  

[PCl  

5

​  

]

[PCl  

3

​  

][Cl  

2

​  

]

​  

 

(b) The equilibrium constant expression for the reverse reaction is

K  

c

​  

(reverse)=  

8.3×10  

−3

 

1

​  

=120.48

(c) (i) When more PCl  

5

​  

 is added, the direction of equilibrium is affected but the value of equilibrium constant is unaffected as K  

c

​  

 is constant at a given temperature.

(ii) When pressure is increased, the value of the equilibrium constant remains unaffected.

(iii) When temperature is increased, the value of equilibrium constant is increased. The reaction is endothermic. When temperature is increased, K  

f

​  

 is increased. Hence, K  

c

​  

=  

K  

r

​  

 

K  

f

​  

 

​  

 is also increased.