The reaction of ICl with hydrogen 2 ICl + H 2 ----> I 2 + 2 HCl is first order i

Question

The reaction of ICl with hydrogen

2 ICl + H2 ----> I2 + 2 HCl

is first order in ICl and second order in H2.

Complete the rate law for this reaction in the box below.
Use the form k[A]m[B]n... , where '1' is understood for m, n ... (don't enter 1) and concentrations taken to the zero power do not appear.

_____________

In an experiment to determine the rate law, the rate of the reaction was determined to be 1.03×10-2 Ms-1 when [ICl] = 0.179 M and [H2] = 0.159 M. From this experiment, the rate constant is _____ M-2s-1.

Explanation / Answer

The reaction is first order in ICI hence the value of power is 1. The reaction is second order in H2 hence the power is 2.

From the given data we can write the rate law in the form ,

rate law = k [a]m[B]n

Rate = K [ICI]1 [H]2

Rate = K [A]1 [B]2

Rate = K [A]m [B]m+n

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