Question

Which of the following reactions lies to the right, favoring the formation of products, and which lies to the left, favoring formation of reactants?

(A) 2NO(g)+O2(g)⇌2NO2(g); Kp=5.0×1012
(B) 2HBr(g)⇌H2(g)+Br2(g); Kc=5.8×10−18

Answer 1

For A: The reaction is lying towards right.

For B: The reaction is lying towards left.

Step-by-step explanation:

There are 3 conditions:

• When
  `K_(c);K_p>1`; the reaction is product favored.
• When
  `K_(c);K_p<1`; the reaction is reactant favored.
• When
  `K_(c);K_p=1`; the reaction is in equilibrium.

• For A:

The given chemical equation follows:

`2NO(g)+O_2(g)\rightleftharpoons 2NO_2(g)`

The equilibrium constant in terms of pressure given to us is
`5.0* 10^(12)`

The given value is very high than 1. So, the reaction is favoring the formation of products.

Hence, the reaction is lying towards right.

• For B:

The given chemical equation follows:

`2HBr(g)\rightleftharpoons H_2(g)+Br_2`

The equilibrium constant in terms of concentration given to us is
`5.8* 10^(-18)`

The given value is very low than 1. So, the reaction is favoring the formation of reactants.

Hence, the reaction is lying towards left.