Rate law seconds and concentration

In summary, the rate law for a chemical reaction is an expression that relates the reaction rate to the concentration of reactants. It is represented as Rate = k[A]^m[B]^n, where k is the rate constant, [A] and [B] are the concentrations of reactants, and m and n are the reaction orders with respect to A and B, respectively. The reaction rate can be determined experimentally by measuring the change in concentration over time and using the rate law to calculate the rate constant and reaction orders.
  • #1
Mag
could you check this?

AB(g) → A(g) + B(g)

Rate = k[AB]^2
k = 0.2L/mol∙S

How long will it take for [AB] to reach 1/3 (one third) of its initial concentration of 1.50M? What is [AB] after 10.0 seconds?

2nd order overall reaction so:
part A
1/[A] - 1/[A]o = (k)(t)
1/0.5 - 1/1.50 = (0.2)(t)
6.667 = t

part B
1/[A] - 1/1.5 = (0.2)(10 s)
[A] = 0.375
 
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  • #2
Correct, and correct !

Just remember to put in the units; time in seconds and concentration in mol/L or M (molar).
 
  • #3
okie dokie. thanks.
 

1. What is the rate law and how is it related to concentration?

The rate law is an equation that describes the relationship between the rate of a chemical reaction and the concentrations of the reactants. It shows how changes in concentration affect the rate of the reaction.

2. How is the rate law determined experimentally?

The rate law is determined by conducting a series of experiments where the concentrations of the reactants are varied and the rate of the reaction is measured. By comparing the data from these experiments, the rate law can be derived.

3. What is the difference between the rate constant and the rate of reaction?

The rate constant, k, is a proportionality constant in the rate law equation that relates the rate of the reaction to the concentrations of the reactants. The rate of reaction, on the other hand, is the change in concentration of a reactant or product over time.

4. How does temperature affect the rate constant?

According to the Arrhenius equation, the rate constant is directly proportional to the temperature. As the temperature increases, the rate constant also increases, resulting in a faster rate of reaction.

5. Can the rate law be used to predict the outcome of a reaction?

Yes, the rate law can be used to predict the outcome of a reaction by understanding how changes in concentration and temperature affect the rate of the reaction. However, other factors such as catalysts and molecular collisions may also play a role in the outcome of a reaction.

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