I need explanation for reaction rate [closed]








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That's a sample reaction:
$$2N\_2+3O\_2->2N\_2O\_3\ \ \ r=k\_1[N\_2]^2[O\_2]^3$$
Why can't I write this as
$$N\_2+\frac{3}{2}O\_2->N\_2O\_3\ \ \ r=k\_2[N\_2][O\_2]^{\frac{3}{2}}$$
Don't bother the elements. Assume it's elementary not mechanism.




A rate law is never deduced from a theoretical equation. NEVER. It is always obtained form experimental measurements. It may happen that the order of the reaction is equal to the stoichiometric coefficient. 


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