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September 2, 2015

Homework Help: Chemistry

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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