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Question
For a reaction A + B ⟶ P, the rate is given by
Rate = k [A] [B]2
How is the rate of reaction affected if the concentration of B is doubled?
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Solution 1
For a reaction, A + B⟶ P
Rate1 = k[A][B]2
If the concentration of B is doubled
Rate2 = k[A][2B]2
Rate1 = k[A][B]2
Rate2 = k[A][2B]2
Rate1 = B2
Rate2 4B2
Rate2 = 4 Rate1
The rate of reaction will be four times the initial rate.
Solution 2
A + B → P
Rate = k[A] [B]2
Since the given reaction has order two with respect to reactant B, thus, if the concentration of B is doubled in the given reaction, then the rate of reaction will become four times.
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RELATED QUESTIONS
The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume :
SO2Cl2 (g) → SO2 (g) + Cl2 (g)
| Experiment | Time/s–1 | Total pressure/atm |
| 1 | 0 | 0.4 |
| 2 | 100 | 0.7 |
Calculate the rate constant.
(Given : log 4 = 0.6021, log 2 = 0.3010)
From the rate expression for the following reaction, determine the order of reaction and the dimension of the rate constant.
\[\ce{CH3CHO_{(g)} -> CH4_{(g)} + CO_{(g)}}\] Rate = k [CH3CHO]3/2
Mention the factors that affect the rate of a chemical reaction.
Which of the following statements is not correct about order of a reaction.
For which type of reactions, order and molecularity have the same value?
Why does the rate of any reaction generally decreases during the course of the reaction?
Why molecularity is applicable only for elementary reactions and order is applicable for elementary as well as complex reactions?
Assertion: Order and molecularity are same.
Reason: Order is determined experimentally and molecularity is the sum of the stoichiometric coefficient of rate determining elementary step.
Assertion: Rate constants determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.
Reason: Reactant molecules undergo chemical change irrespective of their orientation during collision.
Assertion (A): Order of reaction is applicable to elementary as well as complex reactions.
Reason (R): For a complex reaction, molecularity has no meaning.
