art. 1 Let\'s examine a set of kinetics data: Discuss with your group the data i

Question

art. 1 Let's examine a set of kinetics data: Discuss with your group the data in the table below and answer the following questions. Before you write down the answers, make sure that everybody in your group understands how to predict reaction rates from such data. | Experiment # (all at 298K) Initial Rate mol/(L-hr) Initial concentration Initial concentration [Ajo [Blo 3 4 5 0.50 × 10-2 0.50 x 10-2 0.50 x 10-2 1.00 x 10-2 1.50 x 10-2 0.50 0.75 1.00 0.50 0.50 0.20 0.20 0.20 0.40 0.60 a) Without doing any calculation can you predict the order of reaction with respect to A? the order of the reaction with respect to B? the overall reaction order?

Explanation / Answer

a) The order of reaction with respect to A = 0

The order of reaction with respect to B = 1

Therefore, the overall reaction order = 0 + 1 = 1

Explanation: (i) As the initial concentration of A doubles by the concentration of B constant, the initial rate is constant. (ii) As the initial concentration of B doubles, the initial rate also becomes double.

b) The initial reaction rate doesn't change by if the initial concentration of A is halved.

Explanation: The rate of reaction is independent of the initial concentration of A.

c) The initial reaction rate will also be halved if the initial concentration of B is halved.

Explanation: The rate of reaction is directly proportional to the initial concentration of B.

d) The units for the rate constant of the given reaction is time-1, i.e. hr-1

Explanation: rate = k* [A]0 * [B]1

rate (M hr-1) = k * M0 * M1

i.e. units of k = hr-1

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