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अभ्यासक्रम

Rate of Reaction and Reactant Concentration

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Estimated time: 3 minutes
Maharashtra State Board: Class 12

Formula: Rate Law Expression

\[\mathrm{Rate}=k[A]^a[B]^b\]

Where:
k = Rate constant
[A], [B] = Concentrations of reactants
a = Order with respect to A
b = Order with respect to B

Overall Order of Reaction:
Order = a + b

Maharashtra State Board: Class 1

Definition: Rate Law

Rate law is the expression in which the reaction rate is given in terms of molar concentration of reactants, with each term raised to some power, which may or may not be the same as the stoichiometric coefficient of the reacting species in a balanced chemical equation.

Maharashtra State Board: Class 12

Definition: Order of Reaction

The sum of the coefficients (or powers) of the reacting species that are involved in the rate law expression for the reaction represents the order of the reaction.

Related QuestionsVIEW ALL [14]

For the reaction 2A + B → C, rate of disappearance of A 0.076 mol s –1.

  1. What is the rate of formation of C?
  2. What is the rate of consumption of B?
  3. What is the rate of the overall reaction?

Answer the following in one or two sentences.

For the reaction,

\[\ce{CH3Br_{(aq)} + OH^-_{ (aq)} -> CH3OH^-_{ (aq)} + Br^-_{ (aq)}}\], rate law is rate = k`["CH"_3"Br"]["OH"^-]`

What is the change in rate if concentrations of both reactants are doubled?

In a first-order reaction A → B, 60% of a given sample of a compound decomposes in 45 mins. What is the half-life of reaction? Also, write the rate law equation for the above first-order reaction.

For the reaction \[\ce{4NH3 + 5O2 -> 4NO + 6H2O}\], the rate of disappearance of NH3 is 3.6 × 10-3 M/s. What is the rate of formation of water?

Write the rate law for the following reaction:

A reaction that is second order in NO and first order in Br2.

Define order of reaction with suitable examples.

For the reaction \[\ce{2NO_{(g)} + 2H_{2(g)} -> N_{2(g)} + 2H2O_{(g)}}\],

The rate law is, rate = k[NO]2 [H2].

What is the overall order of reaction?

Answer the following in brief.

For the reaction 2A + B → products, find the rate law from the following data.

[A]/M [B]/M rate/M s-1
0.3 0.05 0.15
0.6 0.05 0.30
0.6 0.2 1.20
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