Chapter 5, Problem 5I.2AST

Interpretation Introduction

Interpretation:

It has to be decided whether ammonia tends to form or decompose.

Concept Introduction:

Direction of a reaction:

• If Q < K, the reaction has tendency to proceed toward products.
• If Q = K, the reaction has achieved the equilibrium position.
• If Q > K, the reaction has tendency to proceed toward reactants.

Where, Q is reaction quotient.

Consider a gaseous reaction of the form as given below.

  $aA\left(g\right)+bB\left(g\right)\to cC\left(g\right)+dD\left(g\right)$

The expression of the reaction quotient can be written as given below.

  $Q=\frac{{\left(P_C\right)}^c{\left(P_D\right)}^d}{{\left(P_A\right)}^a{\left(P_B\right)}^b}$

Where, $P_C$ and $P_D$ are partial pressure of product C and D and $P_A$ and $P_B$ are partial pressures of reactant A and B.