Chapter U6, Problem 14STP

Interpretation Introduction

Interpretation:

The time taken for the given reaction to reach at equilibrium needs to be determined.

Concept introduction:

Chemical kinetic is the branch of chemistry that deals with kinetic or rate of a chemical reaction. The rate of reaction can be defined as the change in the concentration of reactant and product with time. The rate of reaction mainly depends on the activation energy.

For a chemical reaction to take place, the two important requirements are activation energy of the reactant molecules and the correct orientation of reactant molecules to collide to form product.

Answer to Problem 14STP

Option (C) is correct option.

Explanation of Solution

Reason for correct option:

In the rerversible reaction, reaction moves in both direction and reaches at equilibrium position. At equilibrium position, the rate of forward reaction is equal to rate of backward direction. In other words, the rate of consumption of reactant equals to rate of formation of product. According to given graph, at 25 sec, the rate of consmption of reactant equals to rate of formation of product, thus, reaction must be at equilbrium at 25 sec.

Conclusion

Reasons for incorrect options:

After 25 sec, the rate of consmption of reactant equals to rate of formation of product therefore reaction must be at equilibrium at 25 sec.