Question

A reaction vessel contains 0.0200 M N2, 0.0600 M H2, and 0.0100 M NH3. With the aid of calculations, predict whether ammonia, NH3, will be formed or dissociate when the mixture goes to equilibrium at 400°C. Kc for the reaction is 0.500 at 400°C. Reaction: N2 (g) + 3H2 (g) 2NH3 (9) (5)​

Answer 1

NH3 will dissociate into N2 and H2.

Given the equation of the reaction; N2 (g) + 3H2 (g) -----> 2NH3(g)

We can calculate the reaction quotient as follows;

Q = [NH3]^2/[N2] [H2]^3

From the question;

[NH3] = 0.0100 M

[N2] = 0.0200 M

[H2] = 0.0600 M

Substituting values;

Q = [0.0100 M]^2/[0.0200 M] [0.0600 M]^3

Q = 23.1

Since Q > Kc, NH3 will dissociate into N2 and H2.

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