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**[SOLVED] Differential equations and chemistry**

Would someone be so kind as to cook me up a sample problem relating DFQ's to chemistry? Maybe a reaction rate type problem? I do know that the rate of change in say, a 2nd order reaction is proportional to the concentration squared, but I don't know exactly how to set it up.

This is for my own interest only, nothing assigned from school. In fact, I want to learn this because even my Chem prof. didn't know exactly how to do it, and there isn't much in chem. that this guy doesn't know. I have just completed my first course in DFQ's, and its application really interests me. Would I be able to understand this type of problem? I only know how to do at most homogenous and non-homogenous 2nd order equations(and also systems of equations), and we started to do Laplace Transforms at the end of the course. I think we skipped some of the more sophisticated stuff.

If someone could come up with something, this would be greatly appreciated.