Use the method of initial rates to determine rate law. A reaction is performed t

Question

Use the method of initial rates to determine rate law.

A reaction is performed to study the gas phase reaction of hydrogen with iodine:

The following reaction rate data was obtained in four separate experiments.

What is the rate law for the reaction and what is the numerical value of k?

Complete the rate law in the box below.
Remember that an exponent of '1' is not shown and concentrations taken to the zero power do not appear.

k = ______ M-1s-1

Experiment [H2]0, M [I2]0, M Initial Rate, Ms-1 1 1.10×10-2 1.50×10-2 2.82×10-22 2 2.20×10-2 1.50×10-2 5.64×10-22 3 1.10×10-2 3.00×10-2 5.64×10-22 4 2.20×10-2 3.00×10-2 1.13×10-21

Explanation / Answer

with respect to H2 reaction is first order

with respect to I2 reaction is first order

so rate law as follows

rate = K[H2][I2]

K = rate / [H2][I2]

K = 2.82 x 10-22 / [0.011][0.015]

K = 2.82 x 10-22 / 1.65 x 10-4

K = 1.71 x 10-18 M-1s-1

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