In a reaction if the concentration of reactant A is tripled, the rate of reaction becomes twenty seven times. What is the order of the reaction?

  • Option 1)

    1

  • Option 2)

    2

  • Option 3)

    3

  • Option 4)

    0

 

Answers (1)

As we discussed in concept

Rate of Law = Dependence of Rate on Concentration -

The representation of rate of a reaction in terms of concentration of the reactants is known as Rate Law

or

The Rate Law is the expression in which reaction rate is given in terms of molar concentration of reactants with each term raised to some power, which may/maynot be equal to stoichiometric of the reacting species in a balanced chemical equation 

- wherein

Formula: aA+bB\rightarrow cC+dD

              Rate=\frac{dR}{dT}

              =\alpha [A]^{x}.[B]^{y}

             =k[A]^{x}.[B]^{y}

 K= rate constant

 

 

Let the reaction be, A\rightarrow B

rate=k[A]^{m}

Now, r_1=k[A]^{m}

If A\rightarrow 3A, then we have r_2= k[3A]^{m}

We know that, r_2= 27r_1

Then k[3A]^{m}= 27k[A]^{m}

3^{m}= 27

m=3

Therefore, the order of reactionn is 3.


Option 1)

1

Incorrect option

Option 2)

2

Incorrect option

Option 3)

3

Correct option

Option 4)

0

Incorrect option

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