Posted by **Jamie** on Wednesday, February 23, 2011 at 10:51am.

The reaction X + Y --> products was studied using the method of initial rates. The initial rate of consumption of X was measured in three different experiments. What is the value of the rate constant, k?

*concentrations are in mol/L and initial rates are in molL-1s-1

Exp 1:

[X]initial=0.6

[Y]initial=0.6

Initial Rate=3.306

Exp 2:

[X]initial=1.2

[Y]initial=0.6

Initial Rate=1.653

Exp 3:

[X]initial=0.6

[Y]initial=1.8

Initial Rate=29.75

My first step was to determine the rate law. However, I got r=k[X]^-1[Y]^2

I check this over numerous times and don't know what I'm doing wrong because you can't have a negative exponent in a rate law.. can you?!

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