Chemistry Help?

Question

Given the following data, deteremine the prders with respect to the concentrations of substances A and B in the reaction: A+ B--> Products

[A]initial:           [B] initial:         Time for reaction:

0.10 M             0.10 M                262 s

0.20 M            0.10 M                  131 s

0.30 M            0.10 M                 87 s

0.20 M           0.20 M                 66 s

0.10 M           0.20 M                 131 s

 

Answer 1

Step 1:

Observe the table.

Rate of the reaction is related to the concentration as , where is the rate of the reaction, is the rate constant, and are molar concentration of the reactants and are the order of the reactants.

If the initial concentration of is doubled, the time taken to complete the reaction is halved.

The rate of reaction is also doubled.

So the order of the reactant is .

Similarly,

If the initial concentration of is doubled, the time taken to complete the reaction is halved.

The rate of reaction is also doubled.

So the order of the reactant is .

Step 2:

Substitute and in the rate of change formula.

Rate of concentration is

.

Solution:

Orders of the reactants are and .

Rate constant  .