Q. 124.2( 26 Votes )

# A mixture of 1.57 mol of N2, 1.92 mol of H2 and 8.13 mol of NH3 is introduced into a 20 L reaction vessel at 500 K. At this temperature, the equilibrium constant, Kc for the reaction N2 (g) + 3H2 (g)⇌2NH3 (g) is 1.7 × 102. Is the reaction mixture at equilibrium? If not, what is the direction of the net reaction?

Answer :

Concentration of substance,

[substance] =

Thus, concentrations of given substances are,

[N2] = 1.57/20 mol L-1

[H2] = 1.92/20 mol L-1

[NH3] = 8.13/20 mol L-1

For a chemical change,

aA + bB cC + dD

Reaction quotient Qc for the reaction is,

Qc =

Where [substance] is concentration of substance at a particular time.

For given reaction

N2 (g) + 3H2 (g)2NH3 (g)

Reaction quotient is,

Qc = =

Qc >Kc . Therefore, the reaction proceeds in reverse direction in order to attain equilibrium. (Equilibrium constant is reaction coefficient at equilibrium state)

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