Page No 103: - Chapter 4 - Chemical Kinetics - Intext Solutions - Ncert Solutions class 12 - Chemistry

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Question 4.3:

For a reaction, A + B → Product; the rate law is given by, . What is the order of the reaction?

Answer:

The order of the reaction

= 2.5

Question 4.4:

The conversion of molecules X to Y follows second order kinetics. If concentration of X is increased to three times how will it affect the rate of formation of Y?

Answer:

The reaction X → Y follows second order kinetics.

Therefore, the rate equation for this reaction will be:

Rate = k[X]² (1)

Let [X] = a mol L⁻¹, then equation (1) can be written as:

Rate₁ = k .(a)²

= ka²

If the concentration of X is increased to three times, then [X] = 3a mol L⁻¹

Now, the rate equation will be:

Rate = k (3a)²

= 9(ka²)

Hence, the rate of formation will increase by 9 times.