Question

A mixture of h2 n2 nh3 with molar concentration respectively was prepared and heated to 500k predict weather ammonia tends to form or to decompose

Answer 1

Answer:

N  

2

​  

(g)+3H  

2

​  

(g)=2NH  

3

​  

(g); Kc = 60 at 500K

Given, [N  

2

​  

]=5×10  

−3

 mol/L  

[H  

2

​  

]=4×10  

−3

 mol/L

[NH  

3

​  

]=2×10  

−3

 mol/L  

Q  

c

​  

=  

[N  

2

​  

][H  

2

​  

]  

3

 

[NH  

3

​  

]  

2

 

​  

 

Q  

c

​  

=  

5×10  

−3

×(4×10  

−3

)  

2

 

(2×10  

−3

)  

2

 

​  

=100  

but K  

c

​  

h2=60  

so, K  

c

​  

 is not equal to Q  

c

​  

 , equilibrium has not been attained.

here, K  

c

​  

<Q  

c

​  

 , the reaction will proceed from right to left. e.g., ammonia decomposes at this stage.

Explanation: